Transition from crawling to walking and infants’ actions with objects and people

In this study, 50 infants were observed at home twice—at 11 months and 13 months. At 11 months, all infants were experienced crawlers; at 13 months, half began to walk independently. At each session, mothers reported demographic information, infants' locomotor history, and receptive and productive language using the long form of the MCDI. To confirm infants' locomotor status (crawler or walker) and examine locomotor proficiency, infants were observed crawling and walking on a marked 3-foot runner. Three published papers report infants' object interactions, object carrying, and maternal responses to infants' object sharing.