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Guides and registry adviceApril 12, 2026
NestBub Editorial
Guide notes
The 4-month sleep regression is really a sleep-development shift. Around this age, many babies become more alert, sleep cycles change, rolling starts or gets close, and feeds, naps, and settling can feel less predictable than they did a few weeks earlier.
7 min read
The word regression can make it sound as if something has gone wrong. Often, the baby is developing rather than going backwards. You might see shorter naps, more night waking, harder transfers into the cot, extra feeding or comfort needs, or a baby who practises rolling and chatting instead of drifting off quickly.
Start by checking expectations. Raising Children Network says most babies aged 3 to 6 months sleep about 12 to 15 hours in 24 hours, may move toward 2 to 3 daytime sleeps, and can still be expected to wake at least once each night. A baby who wakes overnight is not automatically failing sleep.
Look at the whole day before changing the night. At 4 months, overtired and undertired can look similar: grizzling, short naps, false starts, busy legs, feeding fuss, or a baby who seems wired at bedtime. Track sleep, feeds, wakes, and settling for a few days if the pattern feels confusing.
Naps may get shorter while sleep cycles mature. Some babies wake after one cycle and need help linking the next one. Try a short resettle if your baby is calm enough, but do not spend the whole day fighting the cot. A contact nap, pram walk, carrier nap while supervised, or earlier bedtime can sometimes protect the day without becoming the only plan.
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