Does the newborn baby know the difference between night and day?

Newborns sleep an average of 16 or 17 hours a day, with some babies needing a few hours more or less.

During the first three months, your baby will begin to sleep for longer periods at a time, but most infants don’t sleep for more than a four-hour stretch, day or night.

It’s normal for babies to have irregular sleep patterns from birth to 3 months, as the newborns haven’t yet developed sleep/wake cycle.

Unpredictable sleep patterns are also due to nutritional needs. Your baby may need to eat every two to three hours in the first month and every three to four hours in the second month. As she gets older, she won’t need to be fed at night as often.

Does the newborn baby know the difference between night and day? Not at first. At anywhere from 6 weeks to 3 months, his core body temperature and melatonin (a hormone that helps regulate the sleep cycle) will help him start to develop a sleep/wake cycle that differentiates night from day.

Source: Babycenter