Changing formula CMPA

[HazelC95]

Hi how do people give it on alternative formulas before switching

My GP and dietician said 4-6 weeks for the dairy to leave their system and the new milk to get in their system but DD only lasted 5 days on one of them. I took her back to the GP and told them to prescribe something else because her symptoms were worse.

Are you having problems with the new formula @HazelC95?