The study suggests that while boys and younger siblings do not follow the same patterns in parental responsibilities, girls soon become mentally mature enough for caregiving.
"One reason that we didn't find this effect in first-born children who are sons could be that male children help less often with direct childcare than female children do," explained Hahn-Holbrook.
Hahn-Holbrook mentioned that female puberty timing is more adaptable based on early life experiences, which differs from the experience of boys.
The results stem from a comprehensive 15-year study tracking families from pregnancy to adolescence, assessing stress and mental health in mothers.
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