No one knows why some babies cry and others just gurgle and grimace and grin It's been a mystery all through our history (except for the ones medicated with gin) For mother and father would really much rather be able to sleep undisturbed through the night But natural selection just has no effect on the reactions they have when you turn out the light You would have thought kids had to be taught how to be happy or solemn or weird Yet in reality their personalities seem to be fated before they appear Some of the boys are terribly noisy and some people say that it must be genetic But others of them are born gentlemen and plenty of girls are too energetic So if you've caught 'im trying to be naughty you might as well say he just is what he seems But when he's nice take my advice and give all of the credit to his excellent genes