Your implication, lachesis, was that I hadn't read the thread properly, and that what I asked had already been answered. I have, and it hadn't, so maybe you should try reading my posts thoroughly (eg you've just told me that the OP emailed him, which I put in my last post), and reading what the OP had actually said. And I take full responsibility for what I write, thanks, I just didn't like having to repeat myself in response to you implying that I hadn't read the thread properly. 
Gwendoline yes what I said was graphic (not in my first post, but in clarifying what I meant in my second post). But I was graphic because I feel that the OP's husband needs to be fully aware of what he is asking the OP to do - not in an abstract 'I don't feel ready to have another baby so we'll just get rid of it' way, but in being aware that an aborted foetus of 19 or more weeks (by the time the abortion took place) would look very much like his previous premature babies. That he would be making the decision to kill his child at a late stage of foetal development, at a stage when the foetus is only a month or so away from viability. For someone who loves his children very much, and who was distraught at his premature babies' struggles, it seems bizarre to me, as to everyone else, that he would want to rule out the possiblility of a prem and sick baby, by pre-emptively killing it.
It makes me think that either he's a cold and emotionless bastard (which he's never given any sign of to the OP before) or that he hasn't thought through the really graphic reality of what he's asking for, and is thinking in abstract terms. I feel that if the OP sits face to face with him and discusses what he's asked in very graphic terms, then a) she will be able to gauge his reaction and decide which of the above is true, and b) he will (hopefully) be able to grasp the enormity of what he's asked of her, and realise that this is not going to 'blow over' and that she is not going to 'calm down'.
By the way, I am not anti-abortion, in fact I have had an abortion (an early one, admittedly), which I do not regret. But I have seen and held dead foetuses of between 17+5 and c. 22 weeks gestation, and I think that he needs to realise what he is asking for.