Yes there is Bella and Edwards child in the last movie
Yes, Kate Winslet did have a part in this film. She was the narrator.
Generally speaking, it's always the best policy to keep a child safe when the child has a part in a film. The Screen Actor's Guild sets child standards, even if the child/parents are not members. If a parent believes the child is still not protected by SAG, they can make private arrangements with the film's director of the producer.
The duration of Monday's Child - film - is 1.3 hours.
The duration of The Gruffalo's Child - film - is 1800.0 seconds.
The duration of Problem Child - film - is 1.3 hours.
Monday's Child - film - was created on 1967-07-18.
The Gruffalo's Child - film - was created on 2011-12-25.
Problem Child - film - was created on 1990-07-27.
Jungle Child - film - was created on 2011-02-17.
Maybe it depends what type of film it is.
A small part in a film is a "bit part."
Part of a film could be called clip, a scene, or a "snippet".