By the number of responses you have gotten so far, this is obviously a hot topic. I agree with everyone else. It is only yours and your husband's decision. I think it is a decision that you have to take very seriously, because it will change your family's life whichever decision you make. You need to make sure it is the right one for YOU. Don't worry about what other people say. Make sure you have thought of all the pros and cons of each choice, make your decision, and be happy with it.
There are a lot of positives for having only one child and a lot of positives for having more. You have more time, energy and money for one child. It's easier to do everything. There is less mess to clean up, etc. Having more than one is more the intangibles. The love you have for that child you can't quantify. Your children might be the best of friends, not the worst of enemies. I know this is morbid, but when you and DH are old, the burden of taking care of you, making decisions, can be spread among siblings. The fun that is involved having more than one, the interactions. There is a lot more pain involved with more than one-- the fighting, less time for each one.
Let me just reassure you, if you do have another, you will love the next JUST as much as you love your daughter. I know right now you probably feel you could never love another child as much as you love your dd. Your love for your dd grows, doesn't diminish.
In the practical sense, I think having one makes a lot of sense. For me, the love that comes from more far outweighs all of the practical advantages. If your sitting down and being purely logical, the decision seems to point to one child. For me, the BEST present I could give MY child is a sibling. I would totally understand if that would not be your decision.
I love being from a big family, so I gave that to my children as well. I have 5 children.
Good luck with your decision. Take a lot of thought into the decision, it's a big one. I think only you and your husband can make that decision. If you decide to have only one, be happy with that decision, don't worry about what other people say.
I think when other people butt into your personal life, they are doing it with the best intentions. They don't want you to miss out on all the good things that come with having more. Nobody should convince you to have more if that's not right for you.
Sorry for the book. Good luck with your decision. Let us know what you are thinking.
J.