My daughter is 13 months old. I gave her 2 oz. of milk for the first time yesterday, however she has been eating yogurt for months now. About 6 hours later she woke up crying with a very wet stool. When I tried to wipe her clean she began crying histerically and her labia were very red. This morning when she woke I fed her formula and when I went to change her afterward she was screaming again and shaking and her labia were extremely swollen. Is this a milk allergy?? She also had her vaccines 3 days ago (MMR, chicken pox and hepA)