I think she has a milk intolerance - what should I feed her?

[Kmn]

It's probably not lactose, because she was OK and gaining weight well whilst you were breastfeeding, and breastmilk is very high in lactose.
More likely that she is now being exposed to more cows milk protein (which most formulae are based on) than she was when some of her milk was coming from you. And that is taking some getting used to. I wonder about using several "milks", rather than just one, so she's not getting a large dose of any particular soy/cow/goat/nut protein. Try her for a day on food-and-water and she if she's better or worse.

[surprised]

Not sure how old your daughter is, but if she still needs formula, look into getting a script for Neocate (there's another one but I can't remember the name). It is highly processed so that kids who are allergic to casein (the protein in milk) can tolerate it. But you cannot get it without a script (or maybe you can but it's super-expensive).

Bear in mind that the soy protein is very similar to casein, so switching to soy may not help. You might also want to look into the controversies surrounding soy so that you can make an informed choice about whether or not you're comfortable using it.

Note that milk protein allergy is not lactose intolerance. Casein is protein, lactose is a sugar.

[Lisa B]

My DS has a milk protein allergy. The advice I have been given is that most grow out of it between 6 months and 18 months. When I was feeding breast milk I had to go off dairy for him to tolerate my milk. The other thing to consider is a high number of children who have a milk protein allergy also can't tolerate soy. I am lucky on that score as my DS can tolerate soy. We are using soy formula and a high calcium vita soy milk. The other option for formula is a prescription one as mentioned by Surprised. Things like lactose free formula and goats formula still have milk protein. I haven't explored them enough to know if there is less protein or a different form of protein which might make it easier.

When we attempt the next introduction of dairy which should be very soon we will try A2 milk. The paediatrician told us that whilst it still has milk protein that a lot of kids find the protein in this milk easier to digest and is gentler on the tummy.