Sangitisutta 1.11.178

1.11.178

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

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