My hubby didn't want more children (has has some to another partner but i don't really see them as part of our family-they don't live with us or even visit regularly) so that would mean for me DD would be the only child and I hated that thought

Is this by choice? If so, yours or your partners, and did that put any strain on your relationship?
Partners choice and yes I basically told him I would leave. It meant that much to me that DD have a sibling.

Do you get many negative comments?
DH got lots of them when people found out I wanted more and he was refusing.

Does you child ever ask why they don't have any siblings?
No but she is a little but young to understand that at the moment.

Do you think your child is missing out?
From my experience with a large family, yes I think she will. A lot of my fondest memories include my sisters and brother and even now they are my closest friends and support when I need it.

We are alot older as a couple than you and your DH and don't have the luxury of time on our side....If I was younger I think i would just let things go for a while and re-assess in a few years....if you still feel the same way then maybe its time to talk about it.