I came across this interesting fact the other day while reading Dr Spock's baby book:
Babies at birth are more likely to look like their dads than their mums.
The reason for this?
Women know that the child they have laboured for and given birth to is theirs biologically, without any doubt.
Men can never be 100% sure unless a DNA test is performed.
Nature's way is to simply let the bub take after the biological dad, so dads can be sure the mommies havent gone round the block with this one.
Sexist explanation- yes!
But interesting nonetheless...