Infant and Toddler Sleep Problems

Sleep difficulties in babies and toddlers are among the most common — and most exhausting — challenges families face. Around 20–30% of children from infancy to school age experience sleep problems, and among infants and toddlers older than six months, 25–50% continue to wake during the night. The good news is that most of these difficulties respond well to short, structured behavioural treatment combined with parent guidance.

Normal sleep development in early childhood

During the first six months of life, babies undergo a major shift in their sleep patterns. They move from sleep distributed across roughly 5–6 sleep periods per day to more consolidated sleep, with longer night periods and fewer daytime naps. Most babies eventually learn to sleep at least 5 hours continuously at night with minimal waking — but a substantial minority continue to struggle with falling asleep and frequent night waking.

Newborns spend around 50% of their sleep in REM (dream) sleep — about 8 hours per day. Across the first two years, this proportion drops to 20–25% and remains stable thereafter. As children grow, bedtimes get later and total sleep duration shortens. Research shows that today’s children sleep less than children did in past generations — increasing the risk of sleep problems.

Medical and physiological factors such as reflux, milk allergy, skin problems, teething, fevers, and pain can all disturb sleep at this age and should be ruled out as part of any assessment.

How sleep is regulated

Sleep is regulated by two interacting biological mechanisms:

• The sleep-pressure mechanism (S-process) — the longer a child has been awake, and the shorter the previous sleep, the stronger the drive to sleep.
• The circadian mechanism (C-process) — the internal 24-hour clock that governs alertness and sleepiness.

When these mechanisms are out of step — irregular bedtimes, daytime naps too late, feeding patterns that disrupt the rhythm — sleep problems develop. Treatment often works precisely because it brings these two mechanisms back into alignment.

Why infant and toddler sleep problems matter

Sleep difficulties at this age affect more than just rest. They have been linked to:

• Attention and learning difficulties
• Emotional and mood regulation difficulties
• Behaviour and quality-of-life concerns

They also significantly affect parents, contributing to emotional exhaustion, maternal depression, and strain on the parental relationship. Treating the child’s sleep is, in practice, treating the wellbeing of the whole family.

Causes of infant and toddler sleep difficulties

Sleep problems at this age usually arise from a combination of biological, developmental, environmental and behavioural factors. Parental beliefs and expectations also play a major role — well-intentioned but mismatched parental responses often inadvertently maintain the difficulty. Cultural context matters too: room-sharing with siblings, bedroom layout, and family routines all contribute.

Assessment

A proper assessment includes:

• A clinical evaluation by a specialist
• Subjective tools — questionnaires and a sleep diary kept for one to two weeks
• Where appropriate, objective tools such as actigraphy or — in the small number of cases where it is needed — a sleep study (polysomnography)

Further medical investigation is needed when there is suspicion of sleep-disordered breathing (loud snoring, pauses in breathing), severe daytime sleepiness, abnormal movements, or possible seizures.

Treatment of infant and toddler sleep problems

Treatment is based primarily on behavioural interventions and parent guidance. Many infants and toddlers learn to fall asleep under specific conditions — a parent’s presence, rocking, feeding or physical contact — and when they wake briefly during the night they cannot return to sleep without those same conditions being recreated. Treatment focuses on:

• Changing the conditions in which the child falls asleep
• Strengthening the child’s capacity to self-soothe and fall asleep independently
• Building consistent, calming sleep routines
• Modifying the parental responses that are inadvertently maintaining the problem

Research consistently shows that this approach improves sleep, reduces child anxiety, improves daytime behaviour, supports family communication, and significantly improves parental wellbeing.

Practical principles for parents

• Consistent bedtime and wake-up time
• A calm, predictable evening routine including quality time with a parent
• A comfortable sleep environment — dark, quiet, cool
• Clear and consistent boundaries around sleep
• Put the child to bed drowsy but awake — so they learn to fall asleep in their own bed
• Avoid frequent changes of sleep location
• Daytime physical activity (not close to bedtime)
• Daylight exposure in the morning and afternoon
• For older children, limit naps appropriately
• Use a transitional object gently if helpful
• Brief, calm check-ins if the child cries — gradually lengthening the intervals
• Gradual fading of parental presence after independent settling has been established

Consistency and persistence are the keys to success. A coherent, sustained approach over a couple of weeks almost always produces dramatic improvement.