Ask an Expert – SLEEP
Ask an Expert: Newborn and Infant Sleep – What is typical and what can sleep tell us about the developing brain?
Why does my baby wake so often? Why are they so noisy when they sleep? And when will they start sleeping for longer? We look at what research tells us about newborn sleep – and why scientists are interested in what happens in the developing brain while babies sleep.
Sleep is one of the biggest topics for families with a new baby – and often one of the most confusing.
Newborn sleep looks very different from adult sleep. Babies sleep in shorter stretches, wake frequently and can be surprisingly active while asleep. Their sleep also changes rapidly during the first weeks and months of life.
At INFANT, researchers also study sleep as a window into the developing brain. Here, we answer ten common questions about newborn sleep and explore what research is teaching us about sleep, brain development and babies who may need closer developmental follow-up.
What’s normal in the first few months?
What’s happening in a baby’s brain during sleep?
What about babies who need closer development follow-up?
What should parents know?
Safe sleep: what every family should know
Whatever your baby’s individual sleep pattern, a safe sleep environment is important for every sleep, day and night.
Current HSE guidance recommends putting babies on their back for every sleep, using a firm, flat mattress, keeping their head and face uncovered and keeping pillows, cushions, cot bumpers, toys and loose or bulky bedding out of the cot.
Babies should be protected from overheating and cigarette smoke and sleep in their own cot in the same room as their parent or caregiver for at least the first six months.
Safe-sleep advice may differ in some circumstances, including for babies born prematurely or with particular medical needs. Families should follow advice from their healthcare team.
For current Irish guidance, visit the Health Service Executive (HSE):
- Newborn sleep needs: 0–3 months – what to expect from newborn sleep.
- Cot death (SIDS): reducing the risk – current recommendations for reducing the risk of cot death.
- Safe sleeping position – guidance on putting your baby on their back for sleep.
- Where your baby should sleep – information on cots, mattresses, room sharing and other sleep environments.
- Your baby’s sleep temperature – advice on clothing, bedding and avoiding overheating.
- Caring for a premature baby at home – information for families of babies born prematurely.
The research behind this article
Research at INFANT Research Centre, University College Cork, is helping us understand how sleep and brain activity develop from the newborn period onwards, in healthy infants and in babies who may benefit from closer developmental follow-up.
Research referenced in this article includes studies of newborn sleep-wake patterns, the BabySMART infant cohort, sleep EEG and early neurodevelopment, and reviews of sleep and development during infancy.
References
- O’Sullivan MP et al. Reference centiles for infant sleep parameters from 4 to 16 weeks of age: findings from an Irish cohort. Archives of Disease in Childhood, 2023.
- Korotchikova I et al. Sleep-wake cycle of the healthy term newborn infant in the immediate postnatal period. Clinical Neurophysiology, 2016.
- Lenehan SM et al. The Architecture of Early Childhood Sleep Over the First Two Years, 2023.
- Ventura S et al. Infant sleep EEG features at 4 months as biomarkers of neurodevelopment at 18 months, 2025.
- O’Connor C et al. Sleep and infant development in the first year. Pediatric Research, 2026.
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INFANT’s Ask an Expert series takes questions from families and explores what research can tell us about pregnancy, babies and children’s health.











