During the first six to eight weeks of pregnancy, the shape of the embryo's head is formed. Five primitive tissue lobes grow: a) one from the top of the head down towards the future upper lip; (Frontonasal Prominence)b-c) two from the cheeks, which meet the first lobe to form the upper lip; (Maxillar Prominence)d-e) and just below, two additional lobes grow from each side, which form the chin and lower lip; (Mandibular Prominence)
受精後 6 - 8 週已經成型...
and it's 天生。
我朋友個女都有少少兔脣。
...
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