They don't have a baby in the movie.
Not in any official movies, but some fanfics have stated a beast/human hybrid by Belle and the beast. I don't have any links.
The rising action in Disney's Beauty and the Beast is when Belle takes her father's place as prisoner to the Beast and stays at the Beast's castle. This turning point in the film begins the relationship between Belle and the Beast, which is central to the story, begins to take shape.
Belle Baby Carriers was created in 2006.
It depends on the beast.
belle
Darcy Trixie Belle
No Amy does not have a baby. Although she has a dog named Belle.
Una Healy gave birth to a baby girl; Aoife Belle Foden :)
Darccy Trixie Belle
Adam Newacheck goes by Baby Newch.
ADAM Jr
The mom. According to the christian story of Adam & Eve, Eve was created before she was able to reproduce with Adam. Adam & Eve were the only people that did not have a childhood or were born as a baby.