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Allergies and intolerances

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Constant diarrhoea since 4 months old

5 replies

Zitoni · 24/07/2025 21:23

Hi, just wondering if anyone has experienced the below or has any helpful insights.

My baby is almost 7 months old and has always been EBF. About a week before he turned 4 months old, he had diarrhoea, and has had it pretty much every day since. As we didn't have any issues until then, I thought it's something in my diet, the only new thing I was having was a bowl of cereal with cows milk for breakfast, and I re-introduced caffeine with one espresso a day. I stopped both to see if it made a difference, but it didn't. I however never completely cut out dairy like cheese etc, only the milk was new in my routine as I was pretty much having other dairy most days since he was born. I went to the GP and was told to try probiotics, "Enterol." I assume it altered the taste of the milk a bit as my baby was not a fan, but we did persist with it, but it never stopped the diarrhoea. His stool sample came back as fine too, no evidence of bacterial or viral infection.

I limited the dairy I was consuming, and thought maybe once he's on solids it'll improve. WRONG. Oh I was so wrong. We started weaning almost 3 weeks ago and I now can't tell if he's intolerant to certain foods as he constantly has diahhroea and it's hard to tell if any foods are making it worse. I've taken him back to the GP, another stool sample has came back all clear, and I've been advised to cut dairy out completely for 7-10 days to see if that makes a difference, if not, to go back. We're a few days in and currently no change at all. I also called the health visitor who said it might be lactase he can't digest so to try lactose free foods, which we have been doing.

My baby has 0 other symptoms other than the constant diahhroea, he did have dry/rough skin when he was younger, but we were prescribed Aproderm which helped that. He's not unsettled or seems like he's ever in pain, he only cries when he's hungry or overtired, he's been putting on weight still, thriving with his development, and has never shown signs of dehydration despite the constant diahhroea (this is my biggest worry). Despite all that, obviously I do worry as surely this is not normal and something is causing this? I worry there's either a gut issue there or it's something he's reacting to, and that the constant exposure to it could cause damage.

Because of his lack of other symptoms, I don't think this sounds like CPMA, could potentially be lactose intolerance? As he's inevitably getting that through breastmilk. TMI but the diarrhoea is either super liquidy and dark yellowy/green, or green and mucusy. A few times there's been a speck of blood which I told the GP about, but they never commented on that. I guess with constant diarrhoea you could be sore and the blood might be from fissures. But again because of the lack of other symptoms, I might be wrong, but I don't think it seems like an allergy either? But definitely an intolerance of some sort.

I really don't want to stop breastfeeding, but I'm so stuck on how to move forward from here! We literally go through multiple outfits a day as nappies can't hold the diahhroea and it always ends up going on his clothes. It's also challenging to go out as being in his car seat or pram seems to be optimal position to relieve himself, but also ends up getting on both of them which I then need to try clean and wait for it dry before being able to be used again. Obviously though that's all secondary, my main concern is his health and wellbeing.

If anyone has any advice or similar experience, I'd really appreciate it 🥲.

OP posts:
DongDingBell · 24/07/2025 21:38

I'd completely cut out dairy and soya for you and him.

DS1 was totally dairy free until about 18 months.
I was totally dairy free until he was about 8 weeks, then managed to put butter on my toast, and have chocolate - the 2 hardest things for me to cut out!

But it could take several weeks to see if there is any affect.

Jewelbeetle · 24/07/2025 21:47

Your health visitor sounds useless if they think it’s lactose intolerance. You need to completely cut dairy for a month to see the difference it takes that long to work through. Of course, there’s a million things it could be. Until you work though the allergens it’s going to be hard and if you are still breastfeeding you need to cut them from your diet as well as theirs. While still so young I’d bite the bullet and cut several major allergens for a month, see if you improve, then trial ONE thing at a time. Yes, this could take you months.

EternallyUnsurprised · 26/07/2025 22:04

Personally id suggest cutting out wheat/gluten. It only takes 1-2 days to exit your system, and then the same after that to exit babys system. So its not like dairy which can take several weeks to see a difference.

Superscientist · 04/08/2025 11:04

You can't give lactose free products whilst testing a dairy free diet through breastfeeding as you are introducing foods with cows milk protein in. Cmpa is much more common than lactose intolerance. Lactose intolerance is usually picked up early with breastfeed babies as breastmilk is high in lactose.

Re previously tolerating some dairy in your diet and then not. There are lots of things that can mean tolerance changes, it could have been the increase in dairy in your diet, a bug or vaccines (assuming based on age if symptoms) and after they have tipped into reacting to the food they then can't tolerate the lower levels previous tolerated.

I would stop all dairy for both of you, avoid soya meat and dairy substitutes and consider removing soya completely. About half of babies are allergic to both dairy and soya. Also start a detailed food diary listing all foods and symptoms/behaviours. My daughter has a lot of allergies and the food diaries were a life saver. Remember any food can be an allergen too, she's allergic to more vegetables than top14 allergens.

Once you get a handle on symptoms you can test lactose free products directly or do the milk ladder on yourself to see where their tolerance is as you might be able to reintroduce lower levels of dairy like you previously were having

Zitoni · 04/08/2025 20:08

Thanks for the replies everyone, if it weren't for them I'd have only cut dairy out for 7-10 days as my GP advised, not knowing that it takes much longer for dairy to be cleared from the system. Your replies made me research more into it and plan accordingly.

We're just over 2 weeks in now and it's been almost 3 days of no diarrhoea now; almost 3 because Saturday morning it was still liquidy, but later in the day it was more solid - something I haven't seen in a long time! Yesterday was also solid, today there's been nothing yet - I'm sure it'll come at 3am 😅.

Obviously I'll see how things continue, but I'm definitely thinking it's CMPA now as I haven't cut out any other allergens, but still not ruling other things out completely. The only other thing I have cut out actually is banana, as I was having one everyday, and baby seems to enjoy it too, but I wanted to see if it made a difference.

So overall, some baby steps in the right direction I hope!

Thanks again for all the advice 😊

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