My 3month old LO is mostly BF but we supplement with formula because I am an underproducer. I know they say to take a week or so to gradually transition from old formula to the new one but how soon can you change again? I went from Earths Best organic infant formula to Enfamil’s Enspire formula. She was doing great on it but now we are spitting up a lot more so idk if I should switch again? She has been 100% on the Enfamil now for a week. Should I wait a little longer to see if the spit up goes away? I have a few sample cans of the Enfamil Gentlease that I can try later on if needed.