Your baby's liver and immune system still have a ways to go before being ready for life outside the womb, as well. (pregnancy-baby.com)
It is the amount of time a fetus needs to develop the organs and mechanisms needed to deal with the challenges of living outside the womb. (aboutkidshealth.ca)
When you let your baby choose his own birthday, it means he's really ready to begin life outside the womb. (lamaze.org)