A couple of perceptive children

When Annie was six months pregnant with her second child, her three-year-old daughter came into the room when she was getting ready to get into the shower.
She said, 'Mummy, you're getting fat!'
Annie replied, 'Yes darling, but remember Mummy has a baby growing in her tummy.'
'I know,' she replied, 'but what's growing in your bum?'
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A little girl asked her mother, 'Can I go outside and play with the boys?'
Her mother replied, 'No, you can't play with the boys, they're too rough.'
The little girl thought about it for a few moments and asked, 'If I can find a smooth one, can I play with him?'