How big is a 12-week fetus

Patient's question:

No.

Doctor's answer:

At 12 weeks, the fetus has a crown-rump length of 6 cm and a weight of 12-20 grams. By the end of the 12th week, the fetus's body grows rapidly, measuring about 7-9 cm in length and weighing 21-22 grams. It has fully formed into a tiny human shape, but the head is large and round, accounting for half of the body's total length. At 12 weeks, the gender is distinct, the head and neck are clearly separated, and stimulation can trigger sucking-like movements. The eyelids may also react, and the fetus can breathe.

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