Sleeping position and health status of children at six-, eighteen- and thirty-six-month development.
Back-sleep may nudge motor milestones back a couple of weeks, yet the gap vanishes by toddlerhood—still put every baby on their back.
01Research in Context
What this study did
Doctors tracked 1 000 healthy babies born in Taiwan.
They noted each infant’s usual sleep position and checked motor skills at six, eighteen and thirty-six months.
Parents also reported any long-term illness and their own education level.
What they found
Babies who slept on their backs rolled and sat about two weeks later than tummy sleepers.
The small lag was gone by the first birthday.
Family income and chronic illness predicted later development more than sleep position did.
How this fits with other research
Paavonen et al. (2008) and Wong et al. (2023) show big sleep problems in kids with autism or FOXG1 syndrome.
Their work looks at broken sleep, not sleep position, so the findings do not clash.
Together the papers tell us to guard sleep quality in neurodivergent children while still placing all infants on their backs to prevent SIDS.
Why it matters
You can reassure worried parents that back-sleep is safe and any motor delay is mild and brief.
Keep teaching safe-sleep rules, but add extra motor play when the baby is awake to balance things out.
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02At a glance
03Original abstract
Using structural equation modeling to investigate the multiple pathways of sleeping position and children's early development at six-, eighteen- and thirty-six-month children, with parental demographics and child health status controlled. The participants consisted of 1783 six-month children, who were assessed using the Taiwan Birth Cohort Study Instrument. After follow-up, 1620 eighteen-month and 1630 thirty-six-month children participated in the second and third assessments, respectively. With potential confounding factors controlled, children at six-month of mothers with a lower level of education tended to sleep supine (β=-0.08, p=0.001). Compared to those sleeping in the prone and side positions, infants in the supine had slower gross and fine motor development (β=-0.11, p<.001; β=-0.12, p=0.030); however, the effect of sleeping position on the children's development dissipated at eighteen- and thirty-six-month. Sleeping position had effect on children's development at six-month; however, this effect was transient. Instead, chronic illness and maternal level of education had a more persistent effect on children's development.
Research in developmental disabilities, 2011 · doi:10.1016/j.ridd.2010.11.009