Do you actually love your wife at all? Are you just postponing the inevitable divorce because you’re dreading the hassle? If not, ask her to give you a couple of years to think about having another child. There’s a chance her desire to have another one will wane. Once my baby was not a baby any more I experienced a pretty strong spate of baby fever as well but it went away. Either way, what kind of birth control are you guys using? Is she using a mirena or something she can’t secretly stop taking?
I know everyone on this sub says marital counseling doesn’t work but I think people with kids should at least give it a go so you can tell your kid you did everything you could to save your marriage. Your wife sounds like she has a hard time being sensitive to your feelings and maybe counseling could help. YOU pick the counselor and my advice is to pick someone a little older and very experienced.
advice so here you go: dial it down, tell her you’ll think about it and see if you feel differently in a couple of years. There’s a really strong chance she will also feel differently. When my baby wasn’t a baby any more i started wanting another then too but once my children became pre-schoolers with activities they were expensive and I was busy and another child was way less tempting.