Read this part first

A newborn who cannot be roused, or who will not wake to feed, needs assessing now. NICE's postnatal care guideline NG194 lists "unresponsive or unrousable" among its red flags for serious illness in young babies, and separately tells clinicians to be aware of the significance of "a change in the baby's behaviour or signs, such as refusing feeds or a change in the level of responsiveness".

The American Academy of Pediatrics gives the parent-facing version: "Every newborn spends most of her time sleeping. As long as she wakes every few hours, eats well, seems content, and is alert part of the day, it's perfectly normal to sleep the rest of the time. But if she's rarely alert, does not wake up on her own for feedings, or seems too tired or uninterested to eat, you should consult your pediatrician. This lethargy — especially if it's a sudden change in her usual pattern — may be a symptom of a serious illness."

That is the whole test, and it is about alertness and feeding rather than hours.

How much sleep is normal

The HSE gives the range: "Your baby will need about 9 to 18 hours of sleep until age 3 months. They will sleep an average of about 14 hours." It adds the sentence that defuses most comparisons: "Do not compare your baby's sleep to others. Some babies sleep for long periods, others for short bursts."

The rest of the HSE's picture:

Newborns have no set sleep pattern and no sense of day and night.
They may sleep for one to three hours between feeds, and sleep time gets longer with age.
Newborns will be awake for about one to two hours between sleeps.
Sleep is "more likely affected by hunger" than by the clock.

So a baby sleeping fifteen or sixteen hours in a day is inside the published range. The number is not the signal.

Why newborns look so deeply asleep

The AAP describes six states of consciousness in newborns, from deep sleep through drowsiness and quiet alert to crying. A baby in deep, quiet sleep is genuinely hard to wake — the AAP notes that during the deep non-REM stages a baby "may be more difficult to awake". Trying to rouse a newborn in that state and failing tells you about the sleep stage, not the baby. Wait a few minutes and try again as they cycle into lighter sleep, when the eyes move under the lids and the limbs twitch.

Waking a newborn to feed

In the first weeks, feeding frequency is not optional. The NHS's guidance on whether a breastfed baby is getting enough milk sets out the signals to watch: your baby is feeding often, coming off the breast by themselves and seeming content after most feeds, has plenty of wet and dirty nappies, and is gaining weight after the initial loss. A baby who sleeps through feeds does not generate those signals.

Practical ways to rouse a sleepy newborn for a feed, drawn from standard feeding support:

Unwrap them. Take off the swaddle and outer layers so they cool slightly.
Skin to skin. Undress to the nappy and hold them against your bare chest — this is the single most reliable way to get a newborn interested in feeding.
Change the nappy first. It is stimulating and it buys you a more awake baby.
Hand express a little milk onto your nipple or their lips, so there is a taste to respond to.
Stroke their cheek or lip. The AAP notes newborns turn towards a nipple brushed against the cheek and open their mouth if the upper lip is stroked — these are reflexes, and they work even in a drowsy baby.
Try in lighter sleep, not deep sleep.

How often to wake is a judgement your midwife or health visitor should make with you, based on your baby's weight, age and how feeding is going, so this page will not publish a blanket interval.

Sleepiness plus jaundice

This is the specific combination worth knowing. The HSE's newborn sleep page carries one non-urgent advice box, and it is this: talk to a GP or public health nurse if your newborn baby has jaundice — yellowing of the skin — and is very sleepy.

The link runs both ways. A jaundiced baby may be too sleepy to feed well, and a baby who is not feeding well clears bilirubin more slowly, which deepens the jaundice. Jaundice that appears in the first 24 hours of life needs urgent review whatever else is going on, and jaundice still present after two weeks should be checked.

The other things that make a newborn sleepy

Worth knowing so that you can say them on the phone: a difficult birth, prematurity, a recent vaccination, a warm room, jaundice, and infection. Prematurity in particular changes what "normal" looks like — premature babies sleep more and feed less vigorously, and the neonatal team's advice takes precedence over any general guidance.

NICE's warning applies here more than almost anywhere: the presence or absence of individual symptoms or signs may be of limited value in identifying or ruling out serious illness in a young baby. Excess sleepiness in a newborn is treated as a symptom until proven otherwise, not as a personality.

When to call

Call your local emergency number (999 in the UK and Ireland, 911 in the US and Canada, 000 in Australia, 111 in New Zealand) if your baby:

Is unresponsive, floppy, or cannot be woken.
Has a temperature of 38C (100.4F) or above, or below 36C (96.8F).
Looks pale, ashen, mottled or blue.
Has a weak, abnormally high-pitched or continuous cry.
Is grunting, breathing over 60 breaths a minute, or drawing their chest in.
Has a bulging fontanelle, neck stiffness, a seizure, or a rash that does not fade under a pressed glass.

Those are NICE's NG194 red flags for serious illness in young babies.

Contact your midwife, health visitor, public health nurse or GP the same day if your baby: is rarely alert; does not wake by themselves for feeds; is too tired to finish feeds; has suddenly become sleepier than they were; is jaundiced and very sleepy; has fewer wet nappies than usual; or has not regained their birth weight in the expected time. NICE tells professionals that reported parental concern is valid — you do not need a better reason than "something has changed".

What to let go of

A baby who sleeps a lot but wakes reliably, feeds well, has plenty of wet nappies and is gaining weight is a well baby, and the hours do not need counting. Keeping a newborn awake during the day does not improve their nights — the HSE says so directly, and adds that an overtired baby is harder to settle. The thing to watch is not how long they sleep. It is whether they wake.

Newborn Sleeping Too Much