The parents are being completely unreasonable! The pregnant woman was simply answering the child's questions and sharing her joy. It's natural for a child to be curious about a new baby, and the parents' overprotective behavior is stifling. The parents are making a mountain out of a molehill.
The pregnant woman should have respected the parents' wishes and allowed them to share the news with their daughter in their own time. She overstepped her boundaries and created unnecessary drama. Her actions were selfish and inconsiderate, prioritizing her own excitement over the family's feelings.
While the pregnant woman may have been excited, she acted prematurely. The parents had a right to decide when and how to tell their child about the pregnancy. However, the parents' reaction seems extreme. Banning her from babysitting is an overreaction. They should communicate better and find a compromise.