valentine - couldn't agree more! I have a lot of friends who barely managed to have one baby and I'm so happy for them!
I feel it's outrageous to say 1 is not enough, as if those absolute miracle babies didn't matter at all as they don't come as a package deal of 2 or more!
makes my blood boil!
sometimes I want to say to the rude ones - well, never mind they had "only one" - we have 6, so it will still be 2.3 kids/ family statistically!! 
we did have a version of the are you having more?
my 5th pregnancy ended in MC and it was a girl ( wasn't public info).
we had 4 boys up to that point and whether they knew about MC or not people kept constantly asking if we are going to try for a girl.. (as if I could choose, you morons!)
so after much "we'll we are not sure.." I got pretty annoyed and started answering "well, if you must know we had a daughter, but she died, so..." that shut them up!
now we have 5 boys and baby girl, I'm being told constantly - " ah, FINALLY you've got your little girl!" again, as if that was the aim!
don't get me wrong, she's the sweetest and loveliest girlie-whirlie ever, but I truly would have been happy with another boy or boy triplets or whatever!
we are incredibly blessed to have 6 very naughty healthy children, and I love having a big family, but some people are incredibly blessed to have 1 and they are very happy, no doubt!
it's not a bloody competition, or the measure of who's the better parent!
(if in doubt, not me, I'd say just good enough! my kids think I'm the best, but children are easily fooled
)