Maybe you having them sleep on their tummies made them dumb? Perhaps its time that you put them to sleep on their backs. Good luck on helping them get smarter.
Like all good mothers, we listened to our pediatricians 50+ years ago, as my mother listened to Dr. Spock. Maybe the pediatrician was the dumb one. Back then crib death wasn't tied to babies sleeping on their stomachs. And since both sons are in their 50's, helping them to get smarter is a lost cause.