00:24 duration 24 seconds
CHILD 210 Unit 02 Clip 4
Unit 02 > Unit 02: Activities > U02 Observations in Development - Instructions > Clip 4 123321_03D1C6_Clip4(56)
00:17 duration 17 seconds
CHILD 210 Crawling
Unit 02 > Unit 02: Activities > U02 Observations in Development - Instructions > Clip 4