my ds is 5.5 months old and was switched to bottle from breast at 4.5 months. I have him on aptamil which seemed to agree to begin with, then after a couple of weeks he started to get constipated, sick alot and crying with tummy ache.He was then put on antibiotics for an ear infection, which gave him diarrhea, and he was ok then lol! Now hes back off the antibiotics, hes sick alot again, crying with tummy ache and constipated? Do you think it is the formula causing this and if so do you think i should change his milk?If so which formula should i change to?thanks x