When Buddha was about to be born, his mother had a dream of a white elephant with 6 tusks entering her womb. There are many versions of how the dream was interpreted, but it was understood that the time of the birth of the baby was near and sure enough very soon the Buddha was born. Many wise men of the time interpreted the dream to have profound meaning about the child's qualities.
In meditation also, sometimes mothers (and fathers) can get signs that might be hinting about the child that is on the way. Meditation can be beneficial to the unborn child in many other ways as well. A conscious pregnancy clears away many sankharas (impressions) from the child's past lives.
But not just mothers, everyone should meditate :). Need help? Contact us.