How many days a baby stays in the womb before it takes birth?

The human gestation period--the period of time between conception and labor--is approximately forty weeks (280 days), measured from the first day of the mother's last menstrual period. A gestation period of thirty-eight weeks (266 days) is calculated for women who are pregnant by a procedure such as in vitro fertilization or artificial insemination that allows them to know their exact date of conception

Chicken or Rooster 21 days