My DS was a preemie, born 6 weeks early-- (however he weighed 6pounds 3 ounces.) He is now 9 weeks old and weighs 11 pounds!!! Quite remarkable growth for such an early baby. Anyway, he is drinking anywhere from 3 to 6 ounces of breast milk, or soy formula every 3 hours or so. He is obviously growing well, but I worry about his little tummy. Is this a normal amount for a baby boy of this weight and size? He keeps getting constipated

and we keep having to give him diluted prune juice. Poor little guy! I guess I am just looking for reasurance that I am not overfeeding.