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At around 2 months, a day-night pattern begins to gradually develop. [8] At around 3 months, sleep cycle may increase to 3–6 hours, [2] and the majority of infants will still wake in the night to feed. [9] By 4 months, the average infant sleeps 14 hours a day (including naps), but this amount can vary considerably. [10]
Typically grows at a similar rate to the previous month, usually growing between 1 and 1.5 inches (2.5 and 3.8 cm) and gaining about 2 pounds (910 g). [ 23 ] Resting heart rate is usually between 80 and 160 beats per minute, and it typically stays within that range until the infant is about one year old.
Sleep needs Newborns (0–3 months) 14 to 17 hours Infants (4–11 months) 12 to 15 hours Toddlers (1–2 years) 11 to 14 hours Preschoolers (3–4 years) 10 to 13 hours School-age children (5–12 years) 9 to 11 hours Teenagers (13–17 years) 8 to 10 hours Adults (18–64 years) 7 to 9 hours Older Adults (65 years and over) 7 to 8 hours
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It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and wakefulness. In humans, this cycle takes 70 to 110 minutes (90 ± 20 minutes). [1] Within the sleep of adults and infants there are cyclic fluctuations between quiet and active sleep.
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A newborn is, in colloquial use, an infant who is only hours, days, or up to one month old. In medical contexts, a newborn or neonate (from Latin, neonatus , newborn) is an infant in the first 28 days after birth; [ 2 ] the term applies to premature , full term , and postmature infants.