So I tried introducing the aptamil 2 (extra hungry) milk to Layla's diet today as she has been feeding like a maniac recently and has been fussing inbetween feeds. She took the bottle as normal but since then she has had diarrhea 3 times in one afternoon Do their tummy's need time to adjust or is it just an adverse reaction to something in the milk? I'm going back to the Aptamil 1 for now but I wondered whether it is worth trying introducing it again slowley? Any suggestions/advice would be great. Also should i be concerned about the diarrhea?