User blog comment:ReverseZoom101/2 Weird things you may or may not have noticed in The Flash/@comment-30497461-20161208195042

Regarding JJ there are different postions during sex to get a baby boy or girl 9 months later but it kinda depends on the conception date and seeing as his birthday is November 16 as opposed to Sara's October 8 birthday John and Lyla did something different on a different night back in 2014.