My 4 week old DD has been on cow and gate prebiotic after the first week and hasn't had any problems untill the last couple of days. She suddenly seems to be really uncomfortable when having a poo. I don't think she's constipated as she's still having pretty much a poo a feed. I don't know whether it's worth trying her on a different formula but I am reluctant to start to mess with her feeding.
Do you think it could be caused by the formula and is it worth changing it?