ADVICE PLEASE: hi mommies, my baby is one month old and he seems to throw up his formula. I've tried lessening his ounces but he starts to cry that he is still hungry. his lips are dry and I give him a bit of water and he tends to throw that up too. also he's been suffering alot of constipation. his formula has been changed 3 times. went from Gerber gentle to soothe now he's on similac. I don't know what to do...