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The sleep of a 5-month-old baby

Five months is the age of short naps. You put them down, they sleep exactly thirty minutes, and they wake crying, visibly still tired. It is the number one topic at this age, and it is arithmetic before it is a problem.

A cycle lasts about 55 minutes for a five-month-old, and a short nap stops at the end of the first one. Linking two cycles is a skill that is acquired, usually between five and seven months. Until then, a one-cycle nap is not a failed nap.

The other news this month is better: long nights become genuinely possible. Not guaranteed — possible.

Sleep per 24 h

12 – 16 h

Of which at night

10 – 11 h

Naps

3

Awake window

2 h – 2 h 30

One cycle lasts

~ 55 min

Before putting down

~ 15 min

The key point at this age

What actually helps with short naps

Three levers, in this order. Complete darkness first, because daylight alone is enough to prevent the move into the next cycle. Then the awake window: at five months it sits around two hours, and a baby put down too late or too early will take a short nap. Finally, being there as they surface: if you are in the room when they start stirring, a hand on them and some patience is sometimes enough to send them back under.

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They fall asleep

Their night at 5 months, minute by minute

    The whole night, at a glance

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    The timer: when can I put them down?

    Start it the second they fall asleep in your arms.

    --:--before putting them down

    While you wait, keep them against you and try not to move. The countdown will tell you when their sleep is deep enough for the transfer.

    Keep this tab open. The timer stays accurate even if the screen turns off.

    Long nights become possible

    By around six months, a majority of babies string together six hours at least one night in two. "A majority" does not mean "all": a third are not there yet, and they are perfectly fine.

    • Naps anchor themselves at recognisable times: one in the morning, one in the early afternoon, a short one at the end of the day.
    • The late-afternoon nap is the first to go, usually around six to eight months.
    • The need to feed at night drops noticeably, without disappearing for everyone.
    • Deep sleep concentrates at the start of the night: the first few hours are the most solid.

    The classic trap

    Thirty-minute naps are common here: that is one complete cycle and a waking at the wrong moment. It is not a fault, it is arithmetic.

    Falling asleep alone at this age

    ✓ Possible

    Most babies are physically capable of it. Put down awake, they usually need 10 to 20 minutes to fall asleep: that squirming and grumbling is normal, it is not a call.

    Put down awake, a child of this age usually takes 10 to 20 minutes to fall asleep. That squirming is normal.

    How much sleep they need, age by age

    The shaded band is the normal range over 24 hours. Hover to read an age range.

    0h4h8h12h16hbirth6 mo1 year18 mo2 years30 mo3 years
    Total sleep over 24 hOf which at night

    Hover over the curve to read an age range.

    The questions of this age

    Why does my five-month-old only nap for 30 minutes?

    Because they do not link their cycles yet. At the end of the first one they come up into light sleep and wake fully instead of carrying on. It is not a problem with falling asleep, it is a stage: most babies start linking two cycles between five and seven months.

    Can a five-month-old sleep through the night?

    Yes, some do. By six months a majority sleep six hours straight at least one night in two — which means that at five months a good proportion are not there yet and are perfectly fine. "Sleeping through" means six hours, not twelve.

    How many naps at 5 months?

    Three, generally: one in the morning, one in the early afternoon, and a short one at the end of the day that mainly serves to reach bedtime. That last one is the first to go.

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