Milk Allergy

Dr. Greene, I have an 8-week-old son who started producing green stool with bits of blood about three weeks ago. The pediatrician said that he had a positive hemoccult test and that it was caused by colitis and eczema, resulting from an allergy to cow’s milk. He told me to stop breastfeeding and only use Nutramigen. But when I spoke with La Leche League, they said that dairy is out of your system in seven days, so I returned to breastfeeding a week after giving up dairy. But the doctor still disagrees. What do you think?

Milk Allergy

Dr. Greene`s Answer:

One of the most common reasons for blood in a young baby’s stools is an allergy to the cow’s milk protein in dairy products. The same allergy that can cause inflammation in the intestines (colitis) can also cause eczema in the skin. The allergy is not to breast milk, but it is true that enough cow’s milk protein from mom’s diet can come through in the breast milk to cause symptoms in an allergic baby. (Other food allergies can also do this. Milk is the most common, but enough soy, peanut, and eggs can also go through breast milk to cause allergic reactions).

La Leche League is right that the offending foods are usually gone from the breast milk within seven days of removing them from mom’s diet — often even sooner. Most allergic babies do get better while breastfeeding if their mothers give up cow’s milk and foods that contain cow’s milk (which can show up as whey, casein, milk hydrolysates, butter on food labels). But, even after avoiding cow’s milk, there are a few babies who do not improve. If your baby doesn’t get better, you might try eliminating all four of the most common allergens from your diet (milk, soy, peanuts, and eggs). Be sure you find another way to get plenty of calcium.

I would not stop nursing for this unless, perhaps, if your baby were anemic and/or had low protein on a blood test. Even then, I would recommend seeing a pediatric GI doc before deciding to stop. There would probably be a safe way to continue nursing.

Many doctors are not aware of this, but even though Nutramigen is a great hypoallergenic formula that can be very effective for babies who are allergic to milk-based formulas, it does still contain traces of milk. In my experience, those who react to traces of milk in dairy-free breast milk will also react to Nutramigen (within a few weeks, if not at first) and would ultimately need a formula called Neocate, which contains none.

In short, I admire your decision and your pursuing more information. The advantages of nursing far outweigh a tiny bit of inflammation and blood loss in an otherwise growing baby. I wouldn’t stop nursing for that.

Dr. Alan Greene

Dr. Greene is the founder of (cited by the AMA as “the pioneer physician Web site”), a practicing pediatrician, father of four, & author of Raising Baby Green & Feeding Baby Green. He appears frequently in the media including such venues as the The New York Times, the TODAY Show, Good Morning America, & the Dr. Oz Show.

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  1. Saaya

    My daughter developed eczema and threw up @ 6 months on eating dairy and wheat. We had her tested @ 1 and found out she has severe allergies to milk, eggs, peanuts, wheat,tree nuts, coconuts, lentils, chickpeas, peas, millet, sesame(IgE blood test and SPT confirmed).

    I continued to breastfeed her and still do at nights and gave her a lot of probiotics. Mothers milk is truly the best, I breast fed my son till he was 1 1/2 and he has no allergies. With my daughter I made it my goal to do until she was 2.

    She can now eat, lentils, chickpeas, coconuts and baked eggs. We will do a baked milk challenge and continue to heal her. If your baby still cannot handle it don’t worry, give him the neocate and continue to give him probiotics once he is on solids.

  2. Lauren

    Some doctors have suggested that my 9 week old baby could have a milk allergy and some other professional say that he hasnt, he was given neocate milk and has been on it for around 5/6 weeks but just recently we have changed him back to aptimal as he would only take 2 oz bottles of neocate and his symtoms were still the same he didn’t seem any better on neocate, he is now taking 5 oz of apitmal milk. His symptoms are very colicky/silent reflux, he hasn’t got dirrera or his never projectile sick or got skin rashes, he will cry for hours on end in the evening and will cry during the end of his last feed at night! We do get quite a few smiles in the day time, if he had a milk allergy would he be in pain/poorly all day long?? I wish he could have a test so we knew for definite but doctors say that there isn’t one for him, any advise would be great thanks

  3. dominique wilkins

    I have a 3 month old baby boy and he’s on nurimgon and he’s spits up a lot still and we don’t know what’s causing him to throw up so much


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