Riddle for kids

Its mine but my others use it more than me

I follow you everywhere. Who am I??

A man went to a party and drank the punch. He left early. The other people at the party were poisoned by the punch. But the man was not. Why??

What month of the year has 28 days?

What goes up but never comes down?

What can you break even if you don't touch it.

What goes up and down but does not move.

What has words but never speaks.

What building has the most stories

What has 13 hearts but no organs.