Sangitisutta 1.11.177

1.11.177

Puna caparaṃ, āvuso, idhekacco sampajāno mātukucchiṃ okkamati, asampajāno mātukucchismiṃ ṭhāti, asampajāno mātukucchimhā nikkhamati, ayaṃ dutiyā gabbhāvakkanti.

Furthermore, someone is aware when conceived in their mother’s womb, but unaware as they remain there, and unaware as they emerge. This is the second kind of conception.