First, though, a crucial process has to take place ​ — their yolk sac has to begin moving through their umbilical cord and navel into their tiny abdomen.
Akan tetapi, sebelum itu, sebuah proses yang sangat penting harus berlangsung ​ — kantong kuning telur mereka mulai bergerak melewati pusar dan tali pusar ke perut mungil mereka.