DD was switched from Enfamil Lipil to Similac Neosure because she was not up to her birth weight at 2 week appointment. This was a week ago. Since then, she only poops once a day and when she does, it is a big loose runny mess. And she spends the whole day grunting and moaning with the red face and all, like she is trying to poop. At her follow up appointment on Wednesday, she passed her birth weight by 8 oz. She is eating great now, so she will gain weight regardless of what formula she eats. I kinda want to switch her back to Enfamil cuz she was pooping a lot better on it. Should I call pedi to discuss this or just switch back to Enfamil? I don't want to rely on pedi for every little thing for my child, but I don't want there to be any kind of side effects from switching--she didn't have any when we switched before.