Ariel is a 7 month old infant, born at 40 weeks gestation, with Apgar scores of 9 and 10. The baby is up-to-date for well child care and immunizations and has had 2 minor episodic illnesses at aged 4 and 6 months with full recovery. Ariel rolled tummy to back, started to purposely bring hands together, and babble at around age 4 months, and has had a social smile since age 2 months. Ariel is the youngest of three children, and today, parents mention that they are concerned that, “She’s ...