A joke to please girls.

on the first day of kindergarten, Xiaoming said to his father when he came back from school, "Dad, the teacher said today that it used to take at least half a year to raise a chicken, but now it can be eaten in more than forty days. Why?" Dad thought about it and then said, "What's the matter? Your mother and I have had you for seven months. Everyone else is pregnant in October. Why do you think, son?" "Uncle, I don't know."