Garudapurana 1.156.6

1.156.6

sārdhāṅgulapramāṇena romāṇyatra tataḥ param /
tatra hetuḥ sahotthānāṃ bālye bījopataptatā //

at a measure of one and a half finger-breadths further on are the hairs. / The cause of the congenital ones is the affliction of the seed in childhood;