It's beasue milk protein could be passed into breast milk. 小龙女她妈

My doctor told me when we found my baby has milk allergy.

 You should try  Nutramigen as I suggested yesterday. If this still doesn't work, please try Elecare.

Here is the manufacture website for Nutramigen. You may get liquid form from here. It's a safe site since I have been ordering from here for more than one year. I didn't use Elecare. But it's a special formula for those babies who has severe allergy. it's very expensive.

Good luck

http://www.enfamil.com/app/iwp/enf12/product.do?dm=enf&id=/Consumer_Home3/FeedingSolutions/NutramigenLIPIL2&iwpst=B2C&ls=0&csred=1&r=3532821743