Quote
10% increase in IQ if you dance or walk with them daily. (So they get the rhytmic movement).
I read that and my first thought was, "wow! finally an explanation for a purpose behind a baby getting colic!" Can you tell I've dealt with some colicky babies??!!

The trouble with determining the effect of nature v. nurture is the lack of good test data. A mom who works away from the home by necessity may work extra hard in the evenings and weekends she has with her kids, while a SAHM may plop the kids in front of the TV all day. A woman who takes all precautions for a safe pregnancy, then run into complications during birth. I know women in all those categories.
What we do know is GT does tend to run in families, so nature does have an effect. We do know things like alcohol and tobacco use by a pregnant woman can negatively effect a baby. Things like Vitamin B are effective for reducing neural tube defects in the developing fetus.

If every pregnant woman followed all the recommendations, we'd have healthier babies. If every baby was raised with love and stimulation to his needs, we'd have smarter babies. But doing our best doesn't mean we can do every thing perfectly and even if we could that doesn't guarantee perfect results.