Birth order has long been linked to differences in cognition, with firstborn children often outperforming their later-born siblings. Parental engagement and interaction have been suggested as potential influences on this difference. However, only a few studies have compared siblings within the same family, particularly in the first year of life, making it difficult to fully separate birth order from broader family background factors. Such within-family comparisons may help address this gap.
This article was originally published on MedicalXpress.com
