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Sleep in the first year of life
F N Bamford1, R P Bannister, C M Benjamin
1Department of Child Health, University of Manchester.
Insights
Infant sleep patterns change significantly in the first year, with fewer but longer sleep episodes developing. Early weaning and infant feeding difficulty impact sleep, but not sex, birth order, or socioeconomic status.
Area of Science:
- Pediatrics
- Developmental Psychology
- Sleep Medicine
Background:
- Infant sleep undergoes significant developmental changes during the first year of life.
- Understanding these patterns is crucial for infant well-being and parental guidance.
- Factors influencing infant sleep duration and organization require further investigation.
Purpose of the Study:
- To document the evolution of infant sleep patterns over the first year of life.
- To identify factors associated with variations in infant sleep quantity and quality.
- To explore the relationship between feeding practices, infant temperament, and sleep.
Main Methods:
- Longitudinal study tracking sleep patterns of 174 infants.
- Data collected via 24-hour logs at 6, 13, 26, and 52 weeks of age.
- Analysis included infant size, sex, birth order, maternal feeding perception, weaning status, and socioeconomic status.
Main Results:
- Total sleep time decreased by approximately two hours, while sleep episodes halved during the first year.
- A circadian rhythm was established by six weeks of age.
- Smaller infants slept more; maternal perception of feeding difficulty and early weaning were significantly associated with sleep patterns.
- Infant sex, birth order, and socioeconomic status did not significantly affect sleep.
Conclusions:
- Infant sleep patterns demonstrate significant maturation in the first year, characterized by consolidation and circadian rhythm development.
- Maternal feeding experiences and early dietary introductions are key factors influencing infant sleep organization.
- While some factors like infant size impact sleep, others like sex and socioeconomic status do not appear to play a significant role.
Abstract:
The sleep patterns of 174 infants were recorded on one typical day at six, 13, 26 and 52 weeks of age, using a 24-hour log. During the first year of life the number of episodes of sleep was reduced by about 50 per cent, but total sleep time was reduced by only two hours. A circadian rhythm was established by six weeks of age. Smaller infants slept more than larger ones in the first months of life. Sex or birth-order of the child did not affect the duration or number of sleep episodes, but sleep pattern related significantly to whether or not mothers found their infants difficult to feed. Introduction of weaning food at an early stage reduced the number of sleep episodes, but increased the average length of each episode. Socio-economic status showed no significant relationship with number of episodes or total length of sleep.