I know I'm late in my post and you've probably already come to a conclusion but I just had to put my two cents in! I have an only child (she's 7) and I sometimes get anxiety when I think about her not having any siblings. But then I look at how well-adjusted and happy she is. She has lots of friends and I welcome the quite time in our house when it is just the three of us.
As for when she grows up, I think she will always have a lot of friends to lean on. I see people as adults that don't have any interaction with their siblings. Just because you have a brother or sister doesn't mean you will be close with them and that they will be a big part of your life.
I personally think it is wrong to have a child just to give your daughter a sibling. If you truly want another child, great. Do it for you, not your daughter.
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