The longer you can hold off your kids from getting baptized the better. Statistics are on your side after that as 2/3 born into the religion will not remain as adults.
Good comment, here! The teenage JW life is so intolerably stifling and oppressive. Even if raised in the vicinity of JWs, the girls will observe their JW peers being miserable. Meanwhile, they will have an 'out' when asked why they're not baptized ('my father's strict command').
Those unbaptized teenage years are often sufficient to demonstrate to a person that they want nothing at all to do with this cult. And if they remain unbaptized, they can walk without the full repercussions.