Simantam (सीमन्तः)

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Sīmantaḥ is also called Sīmantonnayanam. Sīmanta means parting of hair on head.

सीमन्तोन्नयनं प्रथमे गर्भे चतुर्थे मासि (आपस्तम्बगृह्यसूत्रम्, १४.१)

sīmantonnayanaṃ prathame garbhe caturthe māsi

(Āpastambagṛhyasūtram, 14.1)

Parting of hair by the husband is to be performed during the fourth month of first pregnancy (only).

The husband has to do the parting with the quill of a porcupine while reciting certain Mantras. Both Puṃsavanam and Sīmanta are prescribed during different months by different authors of Gṛhyasūtras (one of the four branches of the Vedāṅga, Kalpa, the others being Śrautasūtram, Dharmasūtram and Śulbasūtram). So it is decided that one should follow his own Gṛhyasūtram.