Teething has long served as the default explanation for a baby's sudden run of rough nights, yet a rigorous recent study using objective sleep tracking technology has genuinely challenged this widely accepted belief.
A Study Built for Genuine Precision
Published in the Journal of Pediatrics, the study followed 849 infants aged 3 to 18 months across the US and Canada, using auto-videosomnography, a computer vision technology that decodes actual sleep behavior from baby monitor footage, to measure sleep for three weeks before and one week after a confirmed tooth eruption. This approach represented a meaningful step up from earlier research, which had relied primarily on parents' subjective memories and impressions rather than continuously recorded, objective data.
What the Objective Data Actually Showed
The researchers found statistically comparable results in total sleep time, nighttime awakenings, or parental crib visits between teething nights and non-teething nights, despite more than half of surveyed parents reporting that they believed teething disrupted their baby's sleep. The study's authors, including economist Emily Oster, noted this gap between subjective impression and objective measurement directly, writing that parents' beliefs about sleep disruption during teething went unsupported by the actual recorded data.
This Isn't the First Study to Find This
An earlier study published in Pediatrics examined 125 infants and similarly found statistically similar sleep duration, night wakings, and overall sleep quality during teething episodes compared with non-teething periods, and a subsequent systematic review found the existing evidence base failed to consistently support a teething and sleep disruption link. Despite this accumulating evidence, the belief remains widespread even among pediatric professionals, with surveys finding broad endorsement of the teething and sleep connection among practicing pediatricians.
Why This Matters Beyond Just Curiosity
Researchers behind the newer study specifically noted that attributing sleep disruption to teething may lead to potentially harmful management strategies, including excessive use of topical anesthetics or pain medication, while also delaying parents from investigating the actual cause of a genuine sleep problem. Since a baby's first tooth typically erupts between four and ten months, an age range that overlaps heavily with other major sleep disrupting milestones like the four month regression and early separation anxiety, it is easy to see how teething became a convenient, if largely inaccurate, explanation.
What to Consider Instead
- Look at developmental timing first, since regressions, new motor skills and growth spurts commonly cluster around the same ages as tooth eruption
- Rule out illness, since fever or congestion can coincide with teething but reflects a separate, genuinely disruptive cause
- Continue offering age appropriate comfort for teething discomfort during the day without assuming it explains every rough night
- Bring persistent sleep disruption to a pediatrician rather than waiting for teething to pass, since the data points elsewhere for the true culprit
The takeaway: Rigorous, objectively measured research finds little support for the popular belief that teething disrupts sleep, and looking beyond this common explanation may lead parents toward the actual cause of a difficult stretch more quickly.