Dear Doctors: I'm breastfeeding my 4-month-old son, and I've lost some weight. I'm naturally thin, but my sister thinks my baby is not getting the nutrients he needs. The pediatrician says my son is doing great, but I'm worried. Do I need to switch to formula?
Dear Reader: When a new mom is in good health and eating a balanced and well-rounded diet, her breast milk has everything that a baby needs …