Anyone else little one get constapated not matter what they eat?

Dalen

The only time he’s not is when he’s had strictly formula. We’ve tried all kinds of food but after each one he doesn’t poop for 3 days and he screams in pain, pushes out these 3-4 inch hard poops and I can’t stand watching that :( so we’ve mostly had to stick with bottles. Anyone out there found a solution for a similar problem ? His 6month appt is the 23rd, I’ll ask then too.