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When babies are first born they dont have a circadian rhythm. At how many weeks does the circadian rhythm start by?

By 16 weeks, babies tend to e in a routine; which exogenous zeitgeber does this demonstrate?

Found that one participants' sleep/wake cycle extended to 29 hours, even tho they were deprived of 'natural' light.

This is the key zeitgaber in humans. It can reset the bodies main endogenous pacemaker, and plays a role in the maintenance of the sleep/wake cycle.

We are influenced by the norms of people around us as to what time we wake up and sleep.