17. Baby’s Sleeping Position Does a baby’s sleeping position affect the development of motor skills? A study in the Archives of Pediatric Adolescent Medicine examined 343 full-term infants at their 4-month checkups for various milestones, such as rolling over, grasping a rattle, reaching for an object, and so on.21 The baby’s favored sleep position—either on the stomach or on the back or side—was reported by the parents of 320 of the children, with the sample results shown here.

The researcher reported that infants who slept in the side or back position were less likely to roll over at the 4-month checkup than infants who slept primarily in the stomach position (p

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Stomach Back or Side Number of Infants Number That Roll Over 121 199 93 119