Why do developmental psychologists study infancy and childhood

Because is during this moment of life that several aspects are developed, such as social interaction, moral building, cultural and identity understanding.

Explanation:

The effective, social and physical development of young children has a direct impact on their development and on the adult, they will become. Hence the importance of understanding well the need to invest in very young children to maximize their future well-being.

you would times this by how many days there are in a year 365*400=$146000