Male babies generally grow faster and bigger than females. This occurs in both the animal and human worlds, but until now they haven't really understood how or why"!!!
the one thing my doctor said is that boys lungs take longer to mature completely while in utero thats about it,
there is a myth that female sperm swim slower and live longer than male sperm.
No, there is no truth to that...
Definitely NOT true. Both my girls have been bigger than average. They take just as long as boys.