知乎，让每一次点击都充满意义 —— 欢迎来到知乎，发现问题背后的世界。 In the course of early blastocyst progress, fluid starts to fill embryo. The embryo begins to grow like a balloon. To implant, the embryo should escape from your shell encompassing it. This is named "hatching." The next day, the eggs are examined to find out if fertilization https://www.ivf.com.mx/