How many months does the baby stays in his mothers womb?

40 weeks, so 10 months. Although ur technically not pregnant until the 4th week of pregnancy. so 9 months 1 eeks, unless u have it early. A baby is considered full term and not premature at 37 weeks gestation.
10 months
Human fetus's stay in the mother's womb anywhere from 8 - 10 months, optimally around 9 months.
At an average of 9 months, each month containing roughly 4 weeks, a baby will stay in its mother's womb for about 38 weeks.
9 months.