astro. oh..
my cousin's theory.
olden days, all couples usually have girls as #1. then got the da jie..
then 2nd one is a boy, if the gap is not very de big. subsequent... *too long la, just stick to these two for theory explanation*
the main reason is: when 1st married, and to save electricity, everyone sleeps early (also nothing much to do at home la). so kena GIRL... that means around evening time, before 10pm la.
when getting #2, then usually jaga baby until very late, or work very hard until midnight, then kena BOY.
I dun buy her theory, but she said its true for her. cause she got all boys. she runs her own business and close shop at 11pm everyday.