Women are smarter by basic instinct and by what we have to do to multitask at home and at work. My mother did that 50 years ago, but it wasn't called multitasking or stress back then. She had a job, two kids and the meals to make with no cook or maid. My father would come home every day and expect lunch. He was a nice guy, but he was clueless!
The science can tell you that the thousands of pseudo-scientific parenting books out there - not to mention the 'Baby Einstein' DVDs and the flash cards and the brain-boosting toys - won't do a thing to make your baby smarter. That's largely because babies are already as smart as they can be; smarter than we are in some ways.