He is experiencing the difficulties of puberty.

According to Freud's theory, the phallic stage is a part of a child's sexual development.

Mothers in the lactation period should strive for a well-balanced diet.

Infancy is an important period for human growth and development.

I am a new student of this school.

Apologizing at this point is too late.

This is the dawn of a new science.

He is still in his tsun phase, so he doesn't talk much.

She is in her dere phase now.

The South Asian language family, like the Austroasiatic language family, is a large language group that includes many languages.