I really do believe it is ingrained into JWs that it's frivolous to actually WANT to have children. I know my JW sister claims all her 3 children were somehow "accidents." And I don't believe that for a minute. It seems to be somehow okay to get accidentally pregnant (while being married, of course). But few witnesses I knew claimed it was actually "planned"....hmm....
I remember my mother bemoaning a trend of pregnancies in the congregation, saying something like, "they sure should KNOW how to prevent them, but they obviously are not doing that..." They obviously like sex. (She was a die hard witness). And when I told her of my second pregnancy, she asked "was it planned"? What a stupid question. I told her, "whether it was planned or not, we are delighted." (it WAS planned).
Ugh. I really don't see ANY passages in JW literature that promotes having children. Good god, I recall having it drummed into married couples' heads that it was beneficial for them to "forego" sexual relations for a time to pursue spiritual interests, (what??)))..
Warped, warped reasoning is all I can say.