Babies' sleeping schedule is unpredictable until about the

"Babies' sleeping schedule is unpredictable until about the age of three months when they produce melatonin, which allows light to influence their internal clocks."
— Peak Human Clock

Research has demonstrated that it is not until the onset of melatonin production, usually occurring around three months of age, that infants exhibit a readily discernible and predictable sleep pattern with light exposure serving as a prime environmental cue.

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