We are in the process of switching DD’s formula milk as she is getting a lot of colic. We just switched (two days ago) but her symptoms seem worse than ever and she is very out of sorts. Should we have phased this change in? The health visitor said either way was fine. How long should we leave it before concluding the new one does not agree with her. I feel really sad to see DD in distress. Does anyone have any advice? TIA