in the times the reason all kings needed male children is beacuse the crown had only been held by a male. So for henry's first born and second born not counting the children coming from mistresses this is not very good odds And with the amounts of stillborn and miscarried children he had from those wifes he needed a new wife not realizing it was something wrong with himself in the bedroom. So he moved on to Jane Seymour who did bare a male child but she died during the 22 hours of childbirth.
