I need your advice regarding my daughter. She is 13 months going on her 14th month on Dec. 3 and weighs about 18.5 lbs. She's been exclusively breastfed since day 1. She can be a picky eater sometimes. She is a very active toddler. Looking at the growth charts, she has been growing steadily. For a while, her pedia was concerned that she may not be gaining as much weight. But upon seeing my daughter last month, she surmised that maybe my daughter is really petite. At one point the pedia suggested that I should stop breastfeeding her and let her take pediasure. What should I do? Is my daughter really underweight?