The op has already said that she's accepted her dh's decision and yet still pp pile on to berate her for wanting a third! Read the op properly fgs.
In marriage there are plenty of things you will have to compromise on, some small, some not so, like this. The important thing is you respect his decision, which you have said you do.
YANBU to be upset about this. Sit down when you have time talk to him. Reiterate that you respect his decision for no more DC, but tell him that you are deeply upset by this, and that you may be for a long time and this is not something you can control.
I assume that you don't go on about it every time you see a newborn because a) what's the point when the decision is made and b) you don't want to upset your dh either.
Is he asking for you to be a robot, slap on a big fake smile and pretend to be ecstatic about it? If so, that's bullshit, and not a great basis for a relationship if he's asking to be deceived rather than have to witness you have any real feelings.
I doubt this is the case, unless you know him to be a twat in other ways? Tell him you're not being manipulative, but he's going to have to stop being aggressive, or he needs to avoid being around both you and new babies?!