Mother's womb is the 1st school of a baby, they say! Well its the truth. Mother should stay calm and and in healthy secure environment. Mother should not smoke or be a passive smoker. No drinking, only healthy food rich in iron. Exercising during pregnancy is best for both mother and baby.
Once you get the healthy body try being healthy mentally. Listen classical music, the Mozart-effect is apparently the concept that classical music makes you smarter.