Good Riddles

Question: what can walk on 4 when they are born, walk on 2 legs when they are older and walk on 3 when they are old uncles and aunties?

Question: You are driving a car.. The car traveled for 25 km and then stopped.. After having lunch he starts the car at exact 3 pm and stops at 5 again.. he travels for only 2 hours every time. Who is the driver?

Question: Without one or the other both would not exist. what i'm I ?

Question: I live in the dark, I have no heart and I'm just like jelly, if you touch me I'll stung you. What am I

Question: I'm the son of water, but when I return to water, I die. Who am I?