My daughter is allergic to milk, she was fine with breast milk though.

The only times I have heard of children having a reaction to breastmilk is due to the mothers diet, one woman we had loved strawberries and ate them all the time, but her baby was allergic to them. As soon as she stoppped eating them it was able to tolerate breast milk. Peanut butter is another one for that.

It has to be due to the complexitiy and chemical aspect of many western diets. For example, strawberries are naturally only available for a limited time and amount in this country, but modern faming mathods and imports from Spain means you get them all year round.

In some of the countries I've lived formula doesn't exist. Babies can't be allergic to breast milk, there's no other option for them.