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masena tu siro dvabhyam
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In the course of a month, a head is formed, and at the end of two months the hands, feet and other limbs take shape. By the end of three months, the nails, fingers, toes, body hair, bones and skin appear, as do the organ of generation and the other apertures in the body, namely the eyes, nostrils, ears, mouth and anus.