Only Child Syndrome?

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I don't mind parents who rightly sing their childs praises when they've done well, but when it's everyday and they go on and on about it  and then ask what can your child do it becomes annoying.

One mum said it's 'only child syndrome' and I must admit throughout the last 14 years of primary school it is usually the parents of only children who go on and on, with the odd parent of more than one child joining in. 

So is that unique to the school my children attend/attended or is it everywhere?