This post probably should be entered under something like Behavior or Behavioral Psychology. It's something I have recently observed and it may not be 100% true. At any rate to make a long story, I noticed that mothers with long hair, regardless of the number of their offsprings above one, generally have both boys and girls. In other words whether it's a boy or a girl is completely random. Where as mothers with short hair and with families no greater than five children, say, generally have only all boys or only all girls. There is no sign of randomness here. Like everything else there must be a reason for this difference.