Thanks all for your contributions. I have read this with interest. DS #2 was just born a week ago today, and I had planned to only have two kids, mostly cause of my age (I turn 37 this week). But since Tom's arrival last week (well after a couple of days to let the labour memories fade a little LOL!!) I have felt very strongly that I want another. It's come out of the blue for me and I can think of all the intellectual reasons in the world why I should stick to the original plan of 2. But just maybe it's not too late for another!