It measures 0.118 inches (3 mm) from crown to rump — basically, from head to bum. Your five-week embryo might be tiny, but there are many exciting things starting to take shape!
Embryonic development in the human, covers the first eight weeks of development; at the beginning of the ninth week the embryo is termed a fetus . Human embryology is the study of this development during the first eight weeks after fertilisation. The normal period of gestation (pregnancy) is about nine months or 40 weeks.
Fetal development – 5 weeks pregnant See how your baby is developing at 5 weeks of pregnancy. The amniotic sac now houses the embryo, which floats in sea of fluid. The embryo is the size of a sesame seed. The neural tube will develop into your baby’s brain, spinal cord, and nerves.