I'd look at it as the glass is half full here, Irish.
You said yourself that he has felt he has gotten less attention with the two children you already have, so ask yourself, why would he want to introduce yet another competitor for your affections? Perhaps because he sees that as something you enjoy and that you value. It is obvious that you enjoy being a mother, embrace the job of motherhood -- so maybe he wants to offer something to make you happy?
I'm not saying he is thinking this through rationally, but that he is looking for something to put you at ease, something to encourage peace between the two of you. Maybe? I'd see it as a gesture (bone-headed as this particular attempt might be) to try to bring the two of you closer together. (Or at least that's what I would think, anyways.) Perhaps subconsciously he has decided he would rather trade yet a little more time taken away from you in exchange for more positive time with you when he does have you. KWIM?
He's obviously very awkward at these motions, isn't he?
