We have a DD (4), and would desperately love a second, but it's looking like it's not going to happen. 
She has started to ask about babies, as ALL of her friends now have brothers/sisters, and some have 2, or 3! I don't know anyone else with only one child.
How can I handle this with her? I'm finding it hard enough to accept anyway, and now I have to look at her little sad face too, when she talks about it!