I've been looking everywhere in the big stores for Aptamil Colic and Constipation milk for my boy and they've all bloody sold out! I've had to get C&G Colic and Constipation milk because of this instead. Do any of you ladies know if this will upset his tummy, going from one brand to another? Surely they all contain the same things more or less. Also arnt they both the same company. Am I worrying over nothing. I've changed his milk before and it caused very bad diarrhea, but that was a complete change of milk rather than the same if you know what I mean. X