Over the 20 year period, scientist from the University of Cambridge, studied 2000 women. Of the 2000, 1000 gave natural birth and the other half underwent surgical procedures to deliver. The women who gave natural birth, 600 breastfed and the other 400 used formula, as where 400 women who delivered via cesarean section breastfed while the other 600 used formula. The babies who were given formula were fed consistently for 1 to 2 years. Babies who were breastfed also were fed consistently for 1-3 years without the introduction of formula or dairy products. Of the 1000 natural births, 500 were male and 500 were female. The same went for those babies delivered via c-section.
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