Are they really?
"the devil's in the details.
" boys are more likely to be born prematurely, and they are more likely to be small for gestational age. All other things being equal, there does appear to be a small gender gap. Research continues, yet we still don't really know why. I would submit that ours is to pray for healthy, full-term babies, and to appreciate what g-d sends us, however small, boy or girl.