Well, He has a belly..
But, He has no belly button, because he was grown and not born.
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Elisabeth Sladen played Sarah Jane Smith in every Doctor Who episode and every Sarah Jane Adventures episode she was in. Jessica Ashworth played the 13 year old version of Sarah Jane Smith in the Sarah Jane Adventures episode "Whatever Happened To Sarah Jane?"
In the Sarah Jane Adventures you will see mostly new faces but Sarah Jane Smith of coure will be in it, K-9 will be in a couple, and in season 3 the doctor will be in a few.
Sarah Jane Smith! Played by Elisabeth Sladen
no he is not he was invented by mrs wormwood and her mum bain but when Sarah Jane smith saw this boy she decided to look after him and called him luke smith and then after that luke started calling Sarah Jane mum .
Luke is Sarah jane's adopted son. He was created by the alien race the Bane as the 'Perfect human'. He is super intelligent and doesn't get ill! (Apart from in last week's episode!) So he has had no real childhood or anything. Hope that answers it.