Yes, CONFINEMENTS is a Scrabble word!

Letter values in Scrabble US: C 3, O 1, N 1, F 4, I 1, N 1, E 1, M 3, E 1, N 1, T 1, S 1.

Is it a valid word?

CONFINEMENTS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

concluding state of pregnancy; from the onset of contractions to the birth of a child
the act of restraining of a person's liberty by confining them
the state of being confined
the act of keeping something within specified bounds (by force if necessary)

Also: lying-in.

Not playable in Scrabble US: PARTURIENCY.