Paternity leaves not only help lessen the load on the mothers, but also has a significant impact on children's cognitive development

The researchers also found that children with fathers who take paternity leave perform better in cognitive development tests and are more likely to be prepared for school at the ages of four and five.
“Father's leave is linked to more involvement in childcare activities such as helping a baby to eat, changing nappies, getting up in the night, bathing and reading to a child, compared to fathers who took no leave. There was some evidence of children having better cognitive outcomes when fathers were more involved early on in their lives”, Australian researcher Jennifer Baxter said.
Source-Medindia