I think siblings are wonderful things to have, but thts cause i have great relationships with each of my 3 sisters. I know many people who detest their siblings and havent spoken to them for many many years. I think the best thing you can do for your child is to be a happy mum, if that means an only child, then just make the most of it. I treasure my experience of being mum to an only, we have so much fun together and he always gets to invite friends over and have fun.
I am from a family of 4 sisters and there are definately 2 middle children ! So having four doesnt solve any sibling problems.
You just have to go with what you are happy with, kids just enjoy what they have.
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