Two babies were lying in a blanket. The 1st baby to the 2nd, "Are you a girl or a boy?"
2nd Baby: I don't know.
1st Baby: OK wait, I shall go inside the blanket and check.
After sometime, the 1st baby came out and said, "You're a girl and I am a boy"!
2nd Baby: How did you come to know?
1st Baby: It's because you're wearing pink socks and I'm wearing blue.