(Music) [From Conception to Birth] [Oocyte] [Sperm] [Egg Inseminated] [24 Hours: Baby's first division] [The fertilized ovum divides a few hours after fusion...] [And divides anew every 12 to 15 hours.] [Early Embryo] [Yolk sack still feeding baby.] [25 Days: Heart chamber developing.] [32 Days: Arms & hands are developing] [36 Days: Beginning of the primitive vertebrae] [These weeks are the period of the most rapid development of the fetus.] [If the fetus continues to grow at this speed for the entire 9 months, it would be 1.5 tons at birth.] [45 Days] [Embryo's heart is beating twice as fast as the mother's.]