1) Don't want to deal with it at meetings is what I think would be on the top of the list.They see what others have to go through.
2) I know a married couple JWs, that are avoiding having kids, and I've heard of reasons from them like...
"don't want to raise them up in this system"
"time is too short"
"I'll wait until the next system of things"
My heart hurts over this cause I truly enjoy them, and feel so sad that the wife will pass up and miss out on such a beautiful love of a child, only to look back when she's in her 60's and cry from regret she never had any, and this "system" hasn't ended yet. Her parents had multiple children, and I think how would she like it if her mother had decided to feel the same way??
I feel she would be a good mother...it's sad.