Ghostwire Tokyo felt like a pretty good length for an open world game. There were a bunch of relatively short side quests, and the usual collectibles but the whole thing was 100% complete in under 30 hours. Thier rougelike DLC add-on might push it over that, but it's basically a whole separate game.

Wishing baby, mom, and you the best of health. Lots of awesome advice here already but I'll add that depending where you are, and if you'll need it, you might want start looking into daycare now. Waitlists around here are months long.
Also, if there are pre-natal classes available, definitely check those out. My wife got a ton of good information but there was also lots of advice for the dads there too.
One final bit of advice which others have already mentioned, but is worth repeating is to have patience. Some days are going to be a slog and it will feel like things will never get back to the comfortable life you had before. And they actually won't, but you'll find yourself in a way better place than you could have imagined back then. I recommend the song You Ruined Everything which sums it up pretty well.

One I haven't seen listed you might want to check out is Rogue Heroes: Ruins of Tasos. It's a co-op, roguelite dungeon crawler. It's surprisingly deep for a game we picked for about $3 on sale.