Newsletter - Week 5 Welcome To Week 5 Your Baby: Getting The
Circulation Going Inside the uterus, the blastocyst (the rapidly
dividing fertilized egg) continues to divide and develop at
great speed, growing 40 times larger during the first month. At
this point, the fertilized egg, or zygote, becomes an embryo.
The embryo divides into three layers where organs and tissues
grow. In the top layer of cells, a groove (called the neural
tube) begins to emerge. Over time, the brain, spinal cord,
spinal nerves, and backbone will develop from this area. In the
middle layer, the heart and the makings of the circulatory
system -- blood cells, blood and lymph vessels -- are starting
to form. By the end of this week, circulation will begin and the
heart will develop quickly. Your embryo, now about the size of a
grain of uncooked rice, will have tiny buds that will become the
arms and legs. Your Body: Pregnancy Pendulum For many women,
learning that they're pregnant is a mixed bag. Planned or
unplanned, they may feel ambiv