You know what that means, don't you? (I've heard it more times than I can count, from well meaning friends and family and although it is absolutely true, it's challenging to truly embrace.)
Reasons beyond reason means that we cannot make sense of it in this earthly life. (Babies dying, infertility, illness -- it is so UNfair!) No amount of tears, of worry, of prayer or even science can make us understand that which is beyond reason.
And it is not because our God is uncaring. He loves, He cares, He creates and He invites all His people home, even my tiny fetus.
But, in this earthly life, our bodies, modern medicine and science are not perfect. No amount of prenatal vitamins or caffeine deprivation can perfect it. It is not our fault; but it is certainly not His either.
(-- ME, August 2012, after my second miscarriage)