How do I make my baby poop?!?! Today will be day three no poop. I know they say it's fine to not have a BM for a few days when FF but he is pushing so hard right now and you can tell he is in pain. We have been haveing gas problems and I started useing little tummys two days ago and it doesn't seem to be helping. He has his one month check up today but I cantwait till then. He just seems soooo uncomfortable right now.