I recently stopped breastfeeding my 12 month old, and tried to switch her to whole milk. Now, I know all pediatricians recommend weaning from the bottle by 12 months, but my situation was that my baby wouldn't allow a bottle anywhere near her mouth until she realized she wasn't going to be nursing anymore, and now she sleeps snuggling her bottle because she loves it so much. So.... that's going to be the next thing we deal with, but for right now, I think she needs it. Anyway, the point is that she never experienced any negative side effects from drinking milk or eating products containing whole milk before.... but when she started drinking 2-3 entire bottles of whole milk each day, she developed a horrible diaper rash that kept getting worse and worse no matter what I did. (She isn't prone to diaper rashes at all, so this was strange to me....) I spoke to a nutrionist, who said it could either be that she just isn't ready for whole milk, or that she may be allergic to milk, and advised me to try Lactaid instead. I started out with some Next-Step formula for a few days, then switched to the Lactaid, and her rash is not getting any worse and is starting to clear up. My question is: If she were allergic to milk, wouldn't she have exhibited some type of reaction before? Or could she have just a mild allergy that only acts up if she has a LOT of milk? Noone else in my family has had this problem, so I'm very confused.... I wish I had an explanation, and it would be nice to know if she will be able to switch to regular milk at some point, or if she needs to drink Lactaid for her whole childhood. It would also be nice to know if I it's ok to use regular milk when I'm cooking, or if it's still ok for her to have other dairy products..... I have no idea, and it's sort-of frustrating!