Congrats on your new baby!!
Parenting is like being sucked into a black hole for the first year. It’s total carnage and will take a while to feel back to yourselves again and ready to make that decision.
No mum I’ve ever met thinks about having more within the first few weeks/months. Your dw is focused on this baby. She may feel differently in the future, so no need to have a discussion right now. Though talking of more will pop into conversation from time to time. There’s no rush right now.
Focus on the three of you, be positive and if you really want more, make sure you do everything you can to support her so she knows she isn’t going through this alone. Cooking, cleaning, taking baby out, caring for her. Make sure she’s getting lots of naps.
I have 3, but each time swore I wouldn’t have any more!
Seeing my partner help with childcare is the biggest factor in having/wanting more. If he’s onboard, and we are a team, that really helps. If I feel overwhelmed and burdened, I can’t fathom the idea of going through it again. Your dw may feel the same.
You may also change your mind too. Each phase has its challenges and you may find some harder to deal with and dread the idea of more children at times.
Go with the flow, enjoy it however best you can. One is great! Easy to manage and enjoy and they will love being the centre of attention, so if it dw decides one is enough, respect that, that’s fine too. If it were the other way round, you would feel pressured and might struggle. Same goes for her.