Suggest it when the baby is at that mindbendingly ultracute and good stage (assuming you get one of those lol). When they are really little they are ... well ... boring. Especially to husbands. Eat-sleep-poop-fart-burp and all that.
LOL... absolutely right.

Problem is that to him, DD has only just now reached the ultracute stage - when she says Dada! all the time, cries when he leaves the house ( ) and gives him massive big bear hugs. And she's 18mths... I'd want to have #3 around when DS is 18mths, so I need to convince him before then!