Garudapurana 2.32.22

2.32.22

tadā drāvamavāpnoti yoṣāgarbhāśaye naraḥ /
raktādhikye bhavennārī śukrādhikye bhavet pumān //

When semen and ovum are equal, the fetuses become eunuchs. / In a day and a night it becomes a mixed mass, in five days a bubble;