I have used Cow and Gate before with my daughter which took to it well and so chose the same with my 4wk old son. I don't think he is taking to it as well as my first. He first had a runny bum and very windy so got bad nappy rash. He was also downing the bottles ( born 10lbs) so we switched to hungrier baby formula. He started off constipated and now its back runny. And to top it off, now he has bumps all over his face and dont know if its baby acne or milk bumps. Does anyone think I should change his formula? My hubby has always wanted to try hipps b/c he heard it was good by numerous people. But whats the difference in each brand and why did you choose the one your using? I don't want to change it but i also don't want my son to keep on it if there is another out there more suited for him. Advice anyone?