I'm going to see one of my friends tomorrow at another friend's LO's birthday party. She sent a group text to people who are going to the party and asked us not to mention her pregnancy or baby to her almost 4 year old son. She is due in late Nov and I assume she is showing...is that normal to wait so long to tell a toddler aged LO?

When did you tell your LO about their sibling on the way?