Growth restricted. Failure to thrive. Supplementing. Growth charts. Percentiles. Growth spurts. Premature. Full-term. For most parents, these phrases can generate anxiety and self-doubt. Am I starving my baby? What am I doing wrong? Maybe if I feed them more, this would rectify itself. Truth is, while there are charts, guidelines, and perimeters, genetic and family history play a big role in development. Just when you begin to feel that you . . .