Kids Riddles

Question: I attach to your hip and I sing all day.
All I want to do is play.

Question: Two children are born in the same hospital, on the same year, on the same day, and have the same father and mother. But they are not twins.

How is this possible?

Question: What goes round the house and in the house but never touches the house?

Question: If a farmer has 5 chickens, two horses, and a wife.

How many feet are on his farm?

Question: I'm the part of a bird that's not in the sky,
I can swim in the ocean and remain dry?

What am I?