My first point would be, ignore your mum, dad, aunty Edna, great-great-great-grandfather's stepson's cousin,... YOU will have to pay for this child, YOU will have to be there for it 24-7, YOU will have to teach it, YOU will have to nurse it,...
People may flock while your child is a baby (then again they may not) but they can always walk away. They certainly won't be as involved once your child is having its terrible twos or hits its teenage years but YOU will still have to be there.
It is no-one's decision but yours and your husbands.
My second point is that your husband married you, not your future child, YOU. That was his decision and he is responsible for that. I'm sure he maybe genuinely feels he is missing out when friends post comments of happy times in the park playing with their son or whatever. Is he equally feeling left out when the women at his work appear having not slept all night because their child was up sick? Does he feel left out when his friends are having to change gross nappies? or their child just will not stop crying? Does he feel left out when his friends' children are playing up?
I ask these questions because if he is a stereotypical male then he won't miss these things at all, nor will he consider that they are part of the package of having a child, he will probably expect that YOU will deal with all the less pleasant aspects of raising the child. It's easy to be envious of the 'fun stuff' (although personally it doesn't appeal to me at all) but he needs to be realistic about what is actually involved in raising a child.
I know a guy who wants 5 or more kids. He has one already and he does NOTHING! He has cuddles from time to time, he rough houses, he plays ball. The minute the child needs discipline that's for mum to do. He doesn't look after his daughter when she's sick. He doesn't take her when she's crying. He doesn't play with her when his favourite program is on but she wants to play. And unfortunately that is pretty normal, even of men who want big families.
It's worthwhile seriously discussing the issue of having children with your husband. But approach it from the point of view of him giving up his job to be the full-time carer while you go back to work a few weeks after the birth and you become the breadwinner. I think only then can a man be honest with himself about his desire for children. As far as I'm concerned if a man REALLY wants a kid enough then he will be willing to be the main carer and will throw himself into that role, otherwise all he actually wants is a cute little bundle of fun to play with for maybe a few years say before it gets to big and starts to annoy him.
Sorry if this sounds harsh but if you don't want children then it would be a very bad idea to cave and have them, the only possibly workable scenario would be your husband being the main carer.
Also, and this might seem negative but I think many prospective parents truly fail to consider this. What if your child has a medical condition and requires 24-hr nursing care? I believe this is something people need to consider. Does your husband want a child enough to be able to deal with such a prospect?