Fertilization takes place inside the fallopian tube. Once together, the cells begin to divide rapidly so that next week, a sonographer may be able to capture baby-to-be’s beginnings during an ultrasound examination. Read more about your baby in week three.
Baby’s Development. After the egg attaches to the uterus, some cells become the placenta while others become the embryo. The heart begins beating during week 5. The brain, spinal cord, heart, and other organs are beginning to form. At the eighth week the developing baby, now called a fetus, is well over a half-inch long — and growing.
At the moment of fertilization, the baby’s genetic makeup is complete, including whether it’s a boy or girl. The fertilized egg starts growing fast, dividing into many cells. It leaves the fallopian tube and enters the uterus 3 to 4 days after fertilization. In rare cases, the fertilized egg attaches to the fallopian tube.Pregnancy Weeks Pregnant Female Reproduction Fertilization Image Diagram - Chart - diagrams and charts with labels. This diagram depicts Pregnancy Weeks Pregnant Female Reproduction Fertilization Image