Fetal weekly change process chart With the continuous advancement of science and technology, people are paying more and more attention to the developmental changes of the fetus. From the fertilized egg to the birth of the fetus, the fetus goes through many stages of growth and changes. Below we will introduce in detail the weekly changes of the fetus from four aspects. Week 1 to Week 4 In the first week to week 4, the fetus is just a tiny group of cells and has not yet formed a head and tail. During this time, the fertilized egg moves toward the uterine wall and implants. Many emotions