In prone 5 to 7 months
In supine 7 to 9 months
sitting 8-11 months
quadruped 9-12 month
standing 12 to 18 months
Stimulus: instability at the base of support
Response: Abductions of arm, leg and concavity of the spine toward the upward side
normal are of response: 5 months through adulthood
Source: Dreeben p. 424
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