The Heart in Action
4 weeks old / 6 weeks pregnant (since LMP)
Here’s what Baby’s baby was up to on September 9...
- The amnion surrounds the embryo with a fluid-filled sac.
- The umbilical cord is in place.
- A tiny trachea or windpipe is forming.
- The heart beats more than 100 times per minute.
- Limb buds (soon-to-be arms and legs) appear.
- Part of the brain that will control coordination is present.
- The skin is so thin, you can see through it!
- The brain's five main sections are visible. (4 wks, 4 days)
- Cerebral hemispheres appear and begin to grow rapidly. (4 wks, 4 days)
