It is about the baby who died in mother's belly in car accident... the doctor brought the baby to them to say goodbye but they did not say goodbye... then something happen to them... in the end they were stuck in the room with a box and they realize they have to say goodbye to their baby..

Just a very wild guess...

Stevie (2008)

They believe the adopted girl is responsible for supernatural occurrences. Actually, it's the spirit of their stillborn son who wants his parents to properly say goodbye to him.

Stevie (TV Movie 2008) - IMDb

Here's the movie trailer: https://www.youtube.com/watch?v=egLNfTUQsq0