Q: My breastfed baby is 3 months old and weighs 18 pounds! I'm worried she's eating too much. Should I try to cut back?
A: I'd say no. I've seen thousands of babies in my practice, including many who outweighed your daughter by 5 or 6 pounds. They looked pretty fat, actually, but all of them grew into normal-sized children. Well, there may have been a few exceptions in the families who believed potato chips and ice cream were suitable daily snacks, but that's another story.
I regard breastfed babies' growth as being "computerized," meaning they eat exactly as much as they need and then follow their own growth curve through infancy and early childhood. The more we try to change this with the quantity of food a child eats, the worse things get.