Skandapurana 6.3.20.52

6.3.20.52

tadante ca mahābhāge garbhādhānaṃ dvitīyakam .
puṃsavanaṃ tṛtīyaṃ tu sīmantaṃ ca caturthakam .. 20.52 ..

After that, O fortunate lady, the rite of impregnation is the second; / the rite for procuring a male child is the third, and the parting of the hair is the fourth;