It has been known for centuries that a woman's firstborn child is
always puny and stupid. Recent studies indicate that concerned
moms should humanely kill and butcher their first child soon
after birth so as not to get too attached, and freeze the remains
(to be extra safe a woman might consider killing the first two).
Later when carrying a child that might be more worth raising the
mother should cook and eat the first child to help grow the one
in her belly, producing a sort of super child.