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.

He said, 'Each person has one life, like a pike or a shrimp,' and decided to live his life with care.