Jatakaparijata 13.44

If conception takes place when a gentle fractional division rises and Saturn is in the seventh house, / delivery occurs after three years; / but if the Moon [is so placed], this rule brings it to pass in twelve years; / what has been declared here should also be considered intelligently at the time of birth.

Now, combinations indicating the birth of a son devoid of ceremonial rites: / When the lords of the father and of actions are ill-placed, while the lord of the body is endowed with strength, / the son born is without the parting of the hair and other rites, beyond doubt. / If a malefic is in the eleventh house in a malefic's home, he will not have the rite of parting the hair.