My mum will regularly tell people her 4th child (my bro) was an accident, but now shes glad she had him as he is "the best of the bunch". This said in my and my siblings' earshot.
A friend's mum had her 3rd and said apparently "I'm really going to love this one"!
Is it a thing - that they youngest is unusually a face and mothers are unashamed to admit it?