Dr. Tom Lacy, right, examines a 2-year-old. New research suggests that many children are missing out on recommended developmental screenings.

According to a study published in the journal JAMA Pediatrics, nationally, less than one third of young children aged 9 to 35 months recently received screenings for developmental delays, with large variation by state. The American Academy of Pediatrics recommends that all children undergo developmental screening at 9, 28 and 30 months and any time there is concern.