My 8 month old dd moved on to Aptamil follow on milk about a week ago (later than 6 months as we did a bulk buy of stage 1 so we were using it up). No problems with stage 1 at all and she was v happy on it. She was on stage 1 Aptamil and had 1 follow on feed per day for about 10 days and then from last weekend all her milk feeds were the follow on milk. On Tuesday last week she developed what I, the GP and the HV have thought was a stomach bug - vomiting and the runs. The vomiting has now stopped but the runs haven't. I have been advised this could go on for 3 weeks or so by the HV. I suddenly realised that she is now on the Apatamil follow on milk for all milk feeds....could this be a reaction to it rather than a bug? She isn't really eating anything, will take some water and milk so isn't getting dehydrated... but I am concerned the runs haven't gotten any better...she is ok within herself and seems to be getting a teeny bit better but has anyone else experienced a similar reaction? Do you think it could be an allergy rather than a bug? Advice gratefully received.