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Study Reveals Genetics Drive Infant Crying Patterns

7/5/2025

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Summary

Story summary

Genetics play a surprising role in how much infants cry, according to a groundbreaking study from Uppsala University and Karolinska Institutet. By examining 1,000 twin pairs in Sweden, researchers discovered that genetics account for 50% of crying variation at 2 months and a staggering 70% by 5 months, revealing that parental influence is minimal.

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Story summary

Genetics play a surprising role in how much infants cry, according to a groundbreaking study from Uppsala University and Karolinska Institutet. By examining 1,000 twin pairs in Sweden, researchers discovered that genetics account for 50% of crying variation at 2 months and a staggering 70% by 5 months, revealing that parental influence is minimal.