Auro (Amitabh Bachchan) is an intelligent and witty 13-year-old boy with an extremely rare genetic defect that causes accelerated aging. He suffers from a progeria-like syndrome. Mentally he is 13, very normal, but physically he looks five times older. In spite of his condition, Auro is a very happy boy. He lives with his mother Vidya (Vidya Balan) who is a gynecologist. Amol Arte (Abhishek Bachchan) is young, progressive and a full-of-ideals politician. He is out to prove to the world that 'politics' is not a bad word. He is a man with a mission. Auro is Amol's son.

Baby Bink couldn't ask for more; he has adoring (if somewhat sickly-sweet) parents, he lives in a huge mansion, and he's just about to appear in the social pages of the paper. Unfortunately, not everyone in the world is as nice as Baby Bink's parents; especially the three enterprising kidnapers who pretend to be photographers from the newspaper. Successfully kidnaping Baby Bink, they have a harder time keeping hold of the rascal, who not only keeps one step ahead of them, but seems to be more than a little bit smarter than the three bumbling criminals.