Babies and small children are especially susceptible to the harmful effects of pesticides, antibiotics, hormones and chemicals. Because baby food is often made of condensed vegetables and fruit, the level of any chemicals found on the food is intensified.
Many pesticides used on fruits and vegetables are toxic to the brain and can interfere with development. The synthetic growth hormone used in meat can potentially cause early puberty in girls [source: Cornell]. Exposure to toxins at certain phases of development can be critical. Toxins that would have no effect on an adult can harm the nervous system and brain of a child. Factor in the baby's small body size, and you could have a dangerous combination.
Even if a child has been eating nonorganic food, making the switch can influence the level of pesticides in the blood [source: Curl]. Eating organic can benefit a child even before he or she is born. Toxic chemicals in a mother's bloodstream can pass through to her fetus [source: Consumer Reports].