Formula mamas

My daughter has been on similar advanced since she was 2 months old and had no problem with it until like a month ago and she started to get constipated and wouldn’t eat more than like 18oz in a day. I finally switched to similar sensitive to see if it would help her poop more and she’s no pooping on a daily basis again and eating way more than she did on the other formula she’s not eating like 28-30oz a day instead of 18oz. Has anybody else switched to sensitive and noticed their baby eating more? I’m guessing her belly just feels better and can eat more now