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Genetics Play Major Role in How Much Babies Cry
A Swedish twin study shows that genetics explain up to 70% of infant crying duration by 5 months of age. While sleep disruptions and settling time are more influenced by environment early on, genetics play a growing role over time.
Drawing on data from 1,000 twin pairs across Sweden, the research used parental questionnaires to assess sleep and crying behaviours when the children were 2 and 5 months old. The remaining variance was attributed to ‘unique environmental factors’, elements of a child’s life not shared with their twin or not easily identifiable through the study’s methods. Reference: Viktorsson C, Yahia A, Taylor MJ, Ronald A, Tammimies K, Falck-Ytter T. Genetic and environmental influences on sleep quality, ability to settle, and crying duration in 2- and 5-month-old infants: A longitudinal twin study.
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