In the Womb

Studying human fetal development via ultrasound technology. Also: a fetoscope procedure is performed to correct a life-threatening condition.

Advanced ultrasound technology is used to trace fetal development of elephants, dolphins and dogs from conception to birth.

Following the fetal development and interaction of twins, triplets and quadruplets with 4-D ultrasonography and other fetal-imaging techniques.

Twin fetal development is chronicled, using advanced ultrasound technology. Also: a look the influence genes have on personalities, sexual preferences and other characteristics.

Chronicling the fetal development of wolves and dogs. Included: a look inside the wombs of a mastiff, a golden retriever and a Chihuahua.

The in-utero journeys of a house cat and a lion are observed.

Advanced ultrasound technology is used to trace fetal development of various animals from conception to birth. Included: sharks; emperor penguins; red kangaroos; and parasitic wasps.

In the Womb: Extreme Animals, which explores the extraordinary methods of reproduction and gestation of four different animals: fish, bird, mammal and insect, using real-time 4-D ultrasound images.

Every newborn baby is a miracle. But for some, the journey to birth is the most dangerous they'll ever endure. Follow four extraordinary pregnancies that faced seemingly insurmountable obstacles.