Look at the average infertility rate in the US (I'm not sure where you are...), it's probably not much different at all than within the borg. It's a fact of life that a lot of people have trouble getting pregnant nowadays, and there are a lot of theories as to why, but it's not because of a curse. I mean, many people believe it's from disposable diapers, and while a lot of people might not believe that, it makes more sense than a curse. There's a lot of toxins out there that we wear, eat, or are exposed to in some way, and it makes sense that it's harder for some people to conceive. Infertility isn't a new thing, though, there have always been people who couldn't conceive a child.
Plus, the average JW is sexually repressed and sexually ignorant. How many JW women know when they're ovulating and the ideal time to try to conceive? I think, as a teen, I taught my mom more about fertility and the cycle than she had learned in her previous 50 years.
As for why a lot of JWs have miscarriages, again, it's not just JWs, it's estimated that as many as 30% of pregnancies end in miscarriage. One of the causes of miscarriage- Lifestyle (i.e. smoking, drug use, malnutrition, excessive caffeine and exposure to radiation or toxic substances). Exposure to toxic substances is inevitable, and how many JWs DON'T grab a cup of coffee every morning? However, the majority of miscarriages are just random and by chance, whether you're a JW or not, it just happens occasionally. I can't really think of many women I know that either didn't have trouble getting pregnant or haven't had a miscarriage. It seems that one or the other applies to nearly all of them. "Worldly" women, btw, I'm not speaking about JWs.
