niemowlę małe dziecko in English:

As she watched the mothers with their infants, she grew sadder and sadder.

The young woman was carrying an infant in her arms.

An infant is not capable of speaking, so it just screams until it gets what it wants.

He looked down at the smiling infant.

Her child is an infant yet.

I have infant clothes to give out.

The infant has been exposed to radioactive rays.