Title: How A Fetus Grows | HowStuffWorks
Headings: How A Fetus Grows
How A Fetus Grows
How A Fetus Develops in the First Trimester
How A Fetus Develops in the Second Trimester
How A Fetus Develops in the Third Trimester
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By the fourth week after fertilization, traces of all the organs of the body are present. Bulges that will become the ears and nose appear. The gut is formed from blind pouches within the embryo; these pouches push forward, creating an opening in the head that will become the mouth. A crude face begins to take shape. At this point, the embryo is only 1/4 inch long. The embryo is called a fetus at the seventh to eighth week. It has grown to a length of one inch. The head is disproportionately large because of the size of the developing brain, while the abdomen seems large because of the growing liver. Fingers and toes appear.