This was done in the post-Fleming literature, but never in the movies. Except it almost was.

Forster said: “Haggis had an idea they weren’t fond of, and I didn’t know if it would work or not. The idea was that Vesper in the last movie, maybe she had a kid, and there would be an orphan out there. It wasn’t anything to insult the franchise. But they felt it wasn’t particularly Bond – him looking for the kid. I think Paul thought he just leaves the kid, he doesn’t deal with it.

So it’s not even Bond’s kid, despite all the headlines. But a child in a Bond movie rubs me WAY the wrong way.