My DS keeps getting constipated. It doesn't seem to matter what he eats. I tried prunes and that helped for one day and then he just got constipated again and it didn't work after that. I recently started giving him 3 ounces of formula a day (doctor's suggestion for borderline anemic issues) and I know that is probably making it worse, but he started getting constipated before the formula. I tried putting a half of a teaspoon of prune apple juice in his bottle to help, but it's not working either. What should I do? Is this something serious that I need to call the doctor about? he's been this way for a few weeks, but he did have a few normal diapers a few days ago, but then he just got right back constipated again.