how many weeks before a fetus is born
Â· just now. Report Abuse. a fetus is normally in the womb for 40 weeks which makes up 9 months but its also possible for a fetus to be fully develpoed at 37 weeks in which the baby can live outside of the womb.here is a source that you can check out how your baby looks week by week. Source(s): http://www.babycenter.com/pregnancy-feta...