Myths About Breastfeeding With CMPA

Over the past few years now my experiences of allergies has been pretty vast, and I have spoken to thousands of mothers who have found themselves in the position that I once did – breastfeeding a child with CMPA (or suspected CMPA) or other food allergies. It’s overwhelming, it’s scary, it’s worrying and concerning. It’s also often made worse by poorly informed health care professionals, or well meaning friends who unwittingly give out outdated or incorrect advice. I’ve heard so many myths, so many untruths, so many totally ridiculous ideas and beliefs about CMPA and it’s so frustrating knowing that there are parents out there who have been badly informed. Here are 7 myths about breastfeeding with CMPA – and the truth behind each one.

1. If your baby doesn’t get hives or have breathing problems then it’s just an intolerance, or CMPI

Something I repeat several times a day – There is NO SUCH THING as CMPI (Cow’s Milk Protein Intolerance). You cannot have a dairy intolerance. The term CMPI is a very outdated term, so if a health care professional uses it you can safely assume that all of their CMPA knowledge is also outdated. CMPI was used to describe what we now know is non-IgE CMPA. Whether your child experiences hives, reflux, eczema, constipation or anaphylaxis, it is due to an immune system response and therefore it IS an allergy.

For more information on IgE and non-IgE CMPA check out the CMPA FAQs and this fact sheet.

This is important, because often I hear from mothers who’s children are “just intolerant” and it seems like it’s not taken quite as seriously as what I’ve seen people refer to as “a true allergy”. In actuality non-IgE CMPA can be just as serious as an IgE allergy in terms of how much harm it can do to a little one, and how much pain exposure to dairy could leave them in.

The only type of milk related intolerance is lactose intolerance, which brings me on to number 2…

2. If your baby is allergic to dairy they must have lactose intolerance

Nope!! This one really irritates me. Lactose intolerance and Cows Milk Protein Allergy are NOT the same thing, in fact they are completely different. Cows Milk Protein Allergy (CMPA) is becoming increasingly common amongst young children, presenting in approximately 3-7%. It exhibits itself in a wide variety of symptoms including any of the following: eczema, reflux, vomiting, diarrhoea/constipation, hives or other types of rashes, conjunctivitis, poor weight gain, “colic”, congestion, I could go on and on.  Symptoms will improve once mum has cut out cows milk protein from her diet, as this will make her breast milk free from the allergen.

Lactose intolerance in comparison is very rare in infants, and will result in a very poorly child. Symptoms are severe and gastro related only – no rashes or eczema, and will most likely result in a baby being ‘failure to thrive’. Symptoms will NOT improve by a mother changing her diet, as breast milk contains lactose regardless of maternal diet. In fact breast milk actually contains more lactose than cows milk does, so if anyone tells you that you can improve your child’s symptoms by going lactose free then you’ll know they are talking nonsense.

To be clear – if your child’s symptoms have improved after removing dairy from your diet this is NOT lactose intolerance.

The only extra thing to look out for here is Secondary Lactose Intolerance, which can be the result of gut damage from undiagnosed food allergies, or something like a severe stomach bug. When the gut lining becomes damaged the body may struggle to produce enough lactase, which is the enzyme needed to breakdown lactose. It is a temporary condition and will improve once the gut is able to heal itself. Breastmilk has lots of healing properties, so will help to support the gut repairs. If you suspect your babies gut may have been damaged you may want to consider introducing some probiotics to help also.

3. You can’t breastfeed a baby with a dairy allergy

Well, I’ve got a group of 3000 women who will show you otherwise!

Sometimes you get people who vaguely understand some of point 2, so they know that breast milk contains lactose regardless of what you eat. Therefore, if they still believe (almost definitely wrongly) that your baby is suffering from Lactose Intolerance they will insist you need to give up breastfeeding. Sometimes they just tell you that you can’t breastfeed because they honestly don’t know what else to say.

It sounds ridiculous, and it is, but I know first hand that mums are being told this. Probably once or twice a week I hear from a mum who has been told by her doctor/health visitor/dietitian that moving to a dairy free formula is the only answer. I could write a whole essay on the reasons behind this – the questionable studies funded by formula companies, the pressure on women in general to second guess their bodies and doubt themselves constantly, the way it’s perhaps viewed as ‘easier’ by some health care professionals to write a prescription instead of talking a new mother through a dairy free diet.

Instead though I’ll tell you this – it is more than possible to continue to breastfeed a child with CMPA. I know that because I spent two years doing it, and I spend every day now supporting more mums who do it too. Mums who now have happy, strong, thriving, reaction free babies who are very happily fed Mummy’s milk. Continuing to breastfeed a child with CMPA means you’re still exposing them to all those magical healing properties I mentioned above, and avoiding the risks associated with formulas. Plus, you’re busy saving the NHS money because that dairy free stuff is expensive, so really the GPs ought to get behind it a bit more!

4. You have to eat free from foods, and they are horrible

This is a myth I feel really passionate about busting for several reasons. If you haven’t already then please do check out the dairy and soya free treat list right now!

One of the first things mothers do once they decide to go dairy free is to head to the supermarket, and I can guarantee you that about 90% will head to the free from section first (unless they’ve already spoken to me!). Why is that a problem? Well, free from sections in supermarkets have vastly improved since we began our CMPA journey 4 years ago. They have tripled in size and offer a huge amount of free from alternatives, which is awesome. However –

a) they are still very geared towards the gluten free market. You will find plenty of milk free things on the shelves, but they are very often made without wheat also. Gluten is tasty and gluten free products are often an acquired taste. And why get acquired to that taste when you don’t actually need to be in that section? New studies actually show that you should avoid eating gluten free products unless it’s medically necessary for you to do so.

Example – I often hear from mums who are using gluten free bread because they assumed they had to. The truth is that most bread is dairy free so there’s no need. Even if you’re soya free too most supermarkets have a few options on the bread aisle (lots mentioned on the list), giving you no reason to have to go without gluten. Gluten free bread isn’t the same at all, and as well as that it’s a whole lot more expensive, see below!

b) it’s a very expensive section. Being free from anything does tend to put the price of your weekly food shop up a little, but it doesn’t need to mean you are paying free from prices for everything. If you are just dairy free, or even dairy and soya then you should be able to find a huge range of yummy things on the regular aisles. Often products from the value ranges will be dairy free, and the cost difference between those and their free from match will be huge.

Example – if you’re dairy free you might be looking for biscuits (who isn’t). You could head straight to Tesco free from section and pick up some free from digestive biscuits – 90p for 160g. Or you could head to the biscuit aisle and find a huge variety of safe biscuits including bourbons, oreos, party rings or ginger biscuits. You could grab some Tesco own brand Plain Chocolate Digestive Biscuits which are only 60p for 300g.

You’ve saved yourself 30p, got double the amount of biscuit, managed to get ones that are chocolate topped too AND they’ll taste way better. Easy!

If you do find yourself needing to shop in the free from section, due to being wheat free or just unable to find a “normal” alternative then don’t worry because it really does taste a lot better than it used to. Just make sure you aren’t shopping there for things you don’t have to.

5. Just a little bit won’t hurt

This or any kind of variation on this is really annoying, and a little worrying to me. Some mums are told that just a little bit is fine, or that they’d be okay to eat dairy as long as they don’t feed/pump and dump for the next x amount of hours. Some mums are told “baked milk won’t cause a reaction” or “you just need to cut out milk, yoghurt and cheese”.

The truth is that further down the line you may actually discover that your little one can tolerate baked milk. You may discover that your little one doesn’t react through breast milk and you actually are safe to eat it in small amounts. But these are things that you need to trial and discover later on, not when you’re first starting out and you’re just desperate you get baby healthy and reaction free. To confirm CMPA in a breastfed baby you need to eliminate the allergen for around 6 weeks. And I mean really, properly eliminate with no slip ups or “cheating”. If you’re still eating baked milk or having “little bits” you will find it really hard to properly confirm whether or not there is an allergy. Plus if there is you are risking causing some real unseen damage on the inside.

As far as having some dairy and then not feeding for a while goes, not a smart move. No one in the world could tell you how long it will take for your milk to be dairy free again after eating something you shouldn’t because it’s so different for everyone and depends on so many things; so you’ll either be forced to go days and days without feeding (risking your supply and your nursing relationship) or you will end up exposing your baby to cows milk protein and causing a reaction – not something you really want to be doing.

Being dairy free does seem hard at first, but it gets easier. Plus – if I had to choose between Dairy Milk or a happy and healthy baby, it’s a hands down choice for me.

6. There’s hidden milk everywhere

Often mums have been terrified about going dairy free because they’ve heard about all this evil hidden milk just waiting to catch you out. I’ve seen ridiculously long lists circulating around Facebook, listing 101 ingredients that may or may not be derived from milk. I’ve heard of mums being advised to avoid lactic acid, cocoa butter, and a whole host of other things which actually are dairy free and perfectly safe.

The truth is there is no hidden milk if you are reading labels anywhere in Europe. Yes, you will find it in some seriously surprising places, but as long as you’re checking the labels of everything you put into your mouth (yes this includes drinks, especially wine, and vitamins/homeopathic medication) then you will not be caught out. Current EU legislation, which will hopefully be around for a bit longer, states that if an ingredient is derived from milk then it has to state that very clearly, usually in bold or capitals. So you may see –

Whole Milk Powder

Lactose (Milk)

Emulsifier (SOYA)

Occasionally if it’s something really obvious (like cream, cheese or whey) then it may not say milk, but it should still be highlighted in some way. This is true for all top 14 allergens, which makes is fairly easy to read labels quickly and efficiently, and establish whether or not something is safe.

Is it a bit of a ball ache checking labels? Absolutely yeah. But is it necessary to memorise 20 different chemical words for milk derivatives or carry around a huge list of possible offenders? Absolutely not no.

7. Allergens don’t actually get through to breastmilk

This one gets the most eye rolls from me, because I wouldn’t have spent hours and hours and hours creating these webpages if this was true. I wish it was, but unfortunately again I’ve got a group full of over 3000 women who can show you differently.

The facts are that most CMPA babies will be able to tolerate cows milk through their mothers breastmilk. The reasons for this are still uncertain. Less than 1% of babies will react through bm according to the stats, but I’ve seen a lot of mums who have eliminated after they’ve started weaning (and seen clear reactions) and then started wondering if their baby’s previous colic/eczema/conjunctivitis/etc etc was actually down to CMPA….

For more information about CMPA do check out my other breastfeeding with CMPA resources, including frequently asked questions, a comparison of dairy free milks, how to confirm CMPA and the dairy and soya free treat list. Visit the breastfeeding with CMPA directory for a full list of all posts.

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7 Myths About Breastfeeding With Cows Milk Protein Allergy - Busting myths about CMPA and dairy allergies, like calling it Cows Milk Protein Intolerance or lactose intolerance, talking about hidden milk or saying allergens don't enter breast milk. Get some CMPA facts here! More support for mums breastfeeding babies with a dairy allergy at


  1. Claire
    25th July 2019 / 8:53 am

    My baby has CPMA. While breastfeeding his only symptoms were a small amount of eczema on his face and cradle cap that wouldn’t go away. When weaning he reacted instantly to Greek yoghurt and came out in horrible itchy hives. The consultant said I was ok to carry on having dairy because he seemed ok with it through my milk, but that he had to be dairy free.

    • 27th July 2019 / 8:31 pm

      Lots of CMPA babies (most in fact) don’t react through breast milk so that’s not unusual. However if you’ve been seeing symptoms like eczema then I would personally want to cut it out and see if it resolves

  2. Liz Mcknight
    7th August 2019 / 7:13 am

    My babe is 3 months he weighs 10 pounds (6 pounds at birth) . For the first two months I believed the rash on his face was a heat rash, then came the constipation , and then a 3 days stay at the hospital because of bad silent reflux. About 3 weeks ago his gaestro dr told me about this CMPA (I have 4 children and never heard of this) . I’m a big cheese and chocolate lover. ( well I WAS) . She prescribed him a formula but he won’t drink from a bottle notbeven if I pump for him. I’m concerned about it his weight gain. What do I do??? This so new to me.

    • 23rd September 2019 / 11:59 am

      Have a read of all of the posts here and hopefully you’ll see an improvement. There’s plenty of dairy free chocolate around don’t worry 🙂 There’s no reason to be concerned about his weight gain due to going dairy free, just keep feeding on demand. Good luck!

  3. Chelsea Scheerer
    10th October 2019 / 12:21 pm

    Great great great article – craving a proper cup of tea and was trying to find out if I gave baby expressed milk if I could have one and how long not to feed her etc. I mean I’m slightly disappointed that the answer is no I can’t have one but this gave me so much more information than I could find anywhere else, so thank you!

    • Pepper
      6th December 2019 / 2:56 pm

      Look up clipper white tea!!! No dairy and it’s like the real thing. It’s a game changer ❤️

  4. Lissette
    28th October 2019 / 8:24 am

    I believe my son suffers from CMPA. Doctor’s already warned me when he had a short stay in the NICU but his pediatrician kept telling me it was fine and I didn’t have to eliminate dairy, even after they believed he was suffering from reflux and now silent reflux. He now has this rash on his chest, arms and back along with the reflux. I drink dairy or eat it on a daily basis, so now I know to eliminate it…. should I continue to breastfeed or should I just do a dairy free formula for now to make sure it is CMPA?

    • 2nd December 2019 / 1:49 am

      Hi Lisette, have a read of my post on how to confirm CMPA. You can definitely still continue to breastfeed but if you suspect a dairy allergy you’ll need to cut dairy out and then reintroduce to confirm x

  5. Alexndra Donnellan-Brown
    9th November 2019 / 8:30 pm

    My baby is nearly 5months old and is ebf. She’s always been a very ‘colicky’ baby. Very unsettled lots of the time. I recently put a post out in fb about how difficult it can be dealing with a constantly crying baby. A few mums contacted me about the potential for allergies. Which in all honesty i had never thought about. Apart from being VERY irratible there have been no major rashes etc although she does have areas of very dry skin, almost sandpaper like.
    I have also been having issues with milk supply due to getting my period back 5weeks pp (awful I know). This month I had ran out of ebm and in a panic thinking she was starving gave her a little formula. She has instantly broke out in hives around her mouth and neck. She also became very upset.
    Could this be the confirmation that she has cmpa?
    If I’m concerned that she does and am about to embark on a dairy/soya free diet do I keep feeding her irrespective that it takes upto 6weeks for clear the system? Any help would be much appreciated!

    • 2nd December 2019 / 1:52 am

      Hi, do have a read of some of my other posts as they will really help 🙂 If she got hives to cows milk formula then that would definitely indicate CMPA yes. However the amount of CMP in breast milk is obviously much, much less than the amount in formula so just continue to feed her while being dairy free and hopefully you’ll see a big improvement in her symptoms

  6. Briege Ferris
    20th November 2019 / 8:00 am

    This website is the best I’ve found on dairy free advice. Only day 1 of going dairy free for breast fed baby whose symptoms are mucusy poos, congestion & tummy pain. Hoping I have a happy, healthy baby in a few weeks. Any advice welcome.

  7. KEM
    21st November 2019 / 10:43 am

    Hi! So glad I found your website. My baby with CMPA was immediately put on Nutramigen formula and has been doing ok (no more blood in stool, still super mucusy) – except I never wanted to formula feed! Wanted to know your thoughts on getting him back on the breast if I don’t necessarily have all dairy out of my system yet (feels cruel but I do want to reestablish my supply) and what do you think about when it’s safe to begin pumping and stashing for daycare? So complicated! But obviously I want what’s best for him and formula is not it.

    • 2nd December 2019 / 1:54 am

      Hi! It’s definitely possible to re-lactate and get baby back to breast, there is some excellent support for this on Facebook so worth searching for that. It takes up to 3 weeks for your breast milk to be free from CMP so I would start stashing from that point – but remember that breast milk does so many other brilliant things so it’s worth getting her back to breast as soon as you can x

  8. V
    23rd April 2020 / 11:18 am

    So glad to have stumbled upon your site. My 4 month old daughter has been diagnosed with what the doctor terms is lactose intolerance, but I’m sure is CMPI. She’s gaining weight well so far. She had persistent rash from birth until about 2.5 months that I thought was a heat rash. She had always had loose multiple stools a day, but she now has almost 10 stools a day with visible blood sometimes. I have cut dairy in all forms since 3 weeks and still see visible blood. I had switched to almond milk and was eating wheat based foods. About 10 days after I had cut dairy, my child’s doctor then asked me to stop nuts and wheat to see if things improve. I have gone on a milk, nut and wheat free diet. I still see blood in stools and multiple poops a day. The doctor now suggests to start rice based (non milk) cereal as first solids to help with the multiple loose stools. I can’t decide if 3 weeks is long enough elimination of milk to start solids (even if at 4.5 months) or to hang in there and watch the multiple loose sometimes bloody stools everyday. Any thoughts will be appreciated.

    • 3rd May 2020 / 4:47 pm

      Sounds like you’ve got some really poor support – sorry to hear that. Firstly lactose intolerance in infants is incredibly rare. It would not cause a rash, and would not improve from a change in maternal diet because breast milk contains far more lactose than cows milk. 3 weeks is not long enough unfortunately, make sure you’re checking absolutely everything you put in your mouth and keep with it. You shouldn’t be cutting out so much from your diet this early on. I would never advise early weaning. Check out my other pages, they will really help, and I would ask to see a different doctor who is more clued up

  9. Ashley
    11th May 2020 / 5:59 pm

    Could baby possibly have a reaction to beef? I’ve cut out dairy/soy/egg and he’s mostly all better but seems to get BAD gas keeping him up on and off all night after I eat beef of any kind

    • 19th May 2020 / 4:14 pm

      Hey, yes about 10% of CMPA babies will react to beef so it’s possible. Best to try eliminating and watching symptoms, then have beef again and see if they return

  10. Mary McNicol
    4th July 2020 / 11:08 am

    I feel so conflicted….. My baby daughter is almost 8 weeks old and exclusively breastfed. From about 3 weeks I noticed congestion when she was laying down and could hear her refluxing and was a lot fussier than my first baby. Spoke with my health visitor and GP and agreed the symptoms sounded like silent reflux. We started on gaviscon and initially it worked a bit, then she had a flare up as I struggled to get it in her, but we got over that and it got a bit better but not completely. GP advised me to go dairy free but not for long enough (I didn’t know better) so I did for 3 weeks with not much improvement. She has had flare ups of her reflux but usually for one day then it settled back to a manageable level. She gets gassy from a poor latch on the boob (we are working on that) but other than that no other symptoms. I feel like I should still continue dairy free for at least 6 weeks but then get anxious that if she isn’t cmpa then I might make her develop an allergy when I reintroduce dairy. But I can’t find any info on whether that is a thing? I know mum’s can get a lactose intolerance themselves after reintroducing dairy but I just don’t want to do the wrong thing and cause more harm than good! Any advice?

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