The report published in Pediatrics says doctors need to thoroughly evaluate young children with suggested screenings at 9, 18 and 30 months of age, and again at four years of age.
Treating any developmental issues early on may ultimately improve the child's ability to catch up.
For example, a 9-month-old baby should be able to roll to both sides, sit well without support and grasp objects.
At 18 months, that child should be able to walk, sit and stand on its own.
Again, if a baby is several months off experts say there is no need to get overly concerned, but do mention any observations to the pediatrician.