Research on the roles of fathers and mothers in infant care reveals that they cooperate and complement each other in a well-functioning family;however,mothers tend to be the usual _____.

Infant Care

The practices and routines involved in ensuring the health, safety, and well-being of babies, typically up to one year of age.

Cooperate

To work or act together towards a common goal or benefit.

Complement

A system of proteins in the blood that enhances the ability of antibodies and phagocytic cells to clear pathogens from an organism.