If your baby wakes from almost every nap after half an hour or so, you're not doing anything wrong. A baby's sleep cycle lasts about 20–50 minutes, compared with around 90 minutes for an adult, according to a Royal Children's Hospital Melbourne sleep review. The same review notes that many babies "cat nap" for just one sleep cycle during the first year. Short naps only need fixing if your baby wakes upset and still tired, or the day is falling apart around them.

This guide covers why catnapping happens, what's normal at different ages, what to try, and when short naps are fine as they are. For how many naps your baby needs, see naps and nap transitions.

How long should a baby's nap be?

There is a wide normal range, and nap length changes a lot across the first year.

Age What's common
0–3 months Sleep periods from about 50 minutes to 2 hours, day and night (Australia's Tresillian)
2–6 months 2–3 day sleeps of up to 2 hours each; some babies catnap for one cycle (RCH)
4–7 months About 3–4 hours of day sleep in total (KidsHealth)
7–12 months 2–3 hours of day sleep in total, usually morning and afternoon (RCH)
8–12 months Each nap anywhere from 30 minutes to 2 hours (KidsHealth)

Sources: Australia's Tresillian, the RCH review, and KidsHealth on 4- to 7-month-olds and 8- to 12-month-olds.

Total sleep matters more than any one nap. The American Academy of Sleep Medicine recommends 12–16 hours per 24 hours, including naps, for babies aged 4–12 months. A baby who takes short naps but sleeps well overnight may be getting plenty.

Why does my baby wake after one sleep cycle?

Babies move between active sleep and quiet sleep. In active sleep they move their arms and legs, suck and even smile; in quiet sleep they barely move, Australia's Tresillian explains. The RCH review adds that newborns spend about half their sleep in light, active sleep, when they can look restless, groan or open their eyes.

At the end of each cycle there is a lighter, drowsier phase. Adults usually roll over and drift into the next cycle without noticing. Many babies surface fully instead, especially if something has changed since they fell asleep, such as no longer being rocked or fed. Australia's Tresillian says sleep cycles average about 50 minutes but can be 30–40 minutes, which is why so many naps end around that point.

What causes short naps?

Often it's simply age and the short infant sleep cycle. When a baby wakes upset and clearly still tired, these are the usual suspects:

  • Overtiredness. The Better Health Channel advises settling a child before they become overtired and agitated. Nationwide Children's Hospital warns that cutting back naps to help night sleep results in overtiredness and a worse night. See overtired baby.
  • Not tired enough. A baby put down well before they show tired signs may sleep one cycle and then wake ready to play. See wake windows.
  • Hunger. The RCH review says newborns' sleep-wake cycles depend largely on whether they are hungry or full. Australia's Red Nose notes a baby is unlikely to fall asleep if they are still hungry.
  • Light and noise. In older babies, daily rhythms and surroundings such as light and noise play a much bigger role in sleep, according to the RCH. Better Health suggests a dark, quiet room for naps.
  • Discomfort. The NHS says being too hot or too cold can disturb sleep. A wet diaper, wind or a blocked nose can wake a baby too.
  • A developmental shift. Naps often wobble around the four-month sleep regression, when learning to roll, or with illness or teething.

How can I help my baby nap for longer?

Start with one or two changes and keep them up for a while before judging. The RCH review notes that changing a sleep pattern can take anywhere from 3–14 days.

  1. Pause and listen. Many babies grizzle, twist or call out as they surface from a cycle. Australia's Tresillian suggests that waiting a moment longer or resettling may let your baby go back to sleep.
  2. Resettle in the crib. Resettling a baby who wakes after one sleep cycle is one of the strategies the RCH review lists. Australia's Tresillian describes starting with a little support and building up as needed, for example shushing, then patting. See responsive settling.
  3. Make the room nap-friendly. Darken the room and keep it quiet, as Better Health suggests. Australia's Red Nose says white noise may help some babies, though the evidence is limited; if you use it, keep it quiet and across the room.
  4. Check timing. Watch for tired signs such as staring, frowning, yawning and losing interest in toys, which Better Health lists, and adjust awake time a little at a time.
  5. Feed first if your baby is hungry. Some families offer the feed a little before the nap rather than as the way to fall asleep; feeding to sleep is also normal, so do what works for you.
  6. Pick one nap to work on. Many families find one nap, often the first of the day, extends more easily than the late-afternoon one, which is usually short anyway.
  7. Know when to stop. If resettling hasn't worked after a reasonable try, get your baby up, have some awake time and try again at the next sleep or with an earlier bedtime.

Keeping resettling safe

Every resettle follows the same rules as any sleep. NICHD Safe to Sleep says to place babies on their backs for naps and at night, on a firm, flat surface with no soft objects. KidsHealth says that once babies consistently roll both ways, it's fine for them to stay in the position they choose. NICHD advises stopping swaddling once your baby starts to roll over. If your baby falls asleep on you to finish a nap, see contact napping for how to do that safely.

When are short naps fine?

Short naps are fine when your baby:

  • wakes happy or settles quickly with a feed or cuddle
  • copes until the next sleep without falling apart
  • feeds well and is growing as expected
  • sleeps reasonably overnight

Nationwide Children's describes 2–5 hours of total day sleep for babies aged 2–12 months, which can come as several short naps as easily as fewer long ones. If your baby is thriving and you're coping, it is reasonable to leave short naps alone and let them change with age.

What should I note in a sleep diary?

For a week, jot down when each nap started and ended, how your baby fell asleep, how they woke (content or upset), the last feed time and bedtime. Patterns such as long awake stretches before short naps, or short naps only in a bright room, often jump out. It's also useful to bring to a doctor or pediatrician.

When should I get help with short naps?

Short naps on their own are rarely a medical problem. Use the NHS urgent help guide for signs of serious illness.

Call 911 now if your baby:

  • is difficult to wake, cannot be woken, or is floppy
  • is struggling to breathe, breathing very fast, grunting or sucking in their tummy
  • has blue, gray, pale or blotchy skin, lips or tongue
  • is having a seizure (fit)
  • is under 3 months old and has a temperature of 38°C (100.4°F) or higher

Get same-day medical advice (your doctor or your pediatrician's after-hours nurse line) if your baby is not feeding, has fewer wet diapers than usual, or seems to be in pain each time they wake.

Mention it at your next check with a doctor or pediatrician if your baby is upset and overtired most days for weeks, is hard to settle for almost every sleep, or you're finding it hard to cope. The RCH review notes that a parent's concern about their child's sleep is a valid reason to talk to a professional, and parenting helplines (your pediatrician's office) can help too. If you ever feel you might harm yourself or your baby, put your baby safely in their crib and call 988 (call or text) or 911.