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Fidgety movements
2-3 months
Weight on hands in prone
4-6 months
Head control
4-6 months
Sitting (no hand)
6-8 months
Sitting up from prone
7-9 months
Creeping on hands and knees
7-9 months
Pulling to stand
8-10 months
Cruising along furniture
10-12 months
Rolling
4-6 months
Taking first steps
Around 12 months (10-17 months)
Describe changes of the rib cage
Infant rib cage is more triangular in shape; gravity causes it to shift inferiorly to a more rectangular shape