You are so far away from being unreasonable, you're not even on the same continent.
He's the one being unreasonable - totally and utterly. Even if you had conceived straightaway , had sailed through your pregnancies, had perfect deliveries, ideal time between babies, never had a whiff of PND - you would still NOT be unreasonable to not want another child. Sorry for the double negative
I personally hate the phrase 'giving him a baby' - makes my flesh crawl.
Yes - it's such a shame women are the ones who decide if they get pregnant, if the keep the child, etc etc. Hey lets be honest for many centuries women did not have that freedom and now we have - I'd thank God if I believed in one.
I would say in all honesty that if a partner demands another child, that this is an abusive situation. Partners do disagree about whether or not to have children and on the number to have. It's one of those situations that does cause heart ache however no one, absolutely no one has the right to demand to you have another child. And yes the one doing the conceiving, the carrying through pregnancy, giving birth get to decide. Simple as that.
I'd be really upset if someone who should love and care for me was insisting that I go through something that would cause me discomfort, pain and mental health problems.
I have a faint smell of control going on here - happy if others disagree. Here you are - 2 lovely children, one off to school, you feeling happy and better than you have for a long time, wanting to get back to work and he wants another child, despite all your problems.
Double down on your contraception.
Maybe have some counselling.
If you don't want another child, you don't have to have one