Whether your baby is a boy or a girl is determined by the chromosome it inherits from its father.
and sex Boys girls having
The Best Pregnancy Videos of the Year No matter what you're going through, check out these videos offering a mixture of spoofs, uplifting tales, and somber accounts of pregnancy. Shettle LB. More precisely, interactions with adults Adu showed a significant decrease from 2—3 to 4—5 years, becoming rare in the two oldest age groups. These results were supported in the subsequent structural model, which suggested that girls who had other-sex best friends in eighth grade also demonstrated higher rates of antisocial behavior. Gender and relationships: A developmental account.
The work by Corry Gellatly, a research scientist at the university, has shown that men inherit a tendency to have more sons or more daughters from their parents. The contribution of the socio-cultural and biological factors in human sex social differences is not yet known given their complex interplay  , .