If pesticides are necessary, use in the safest manner possible. Keep pesticides stored away from children, preferably locked away. Only use pesticides when children are not present and follow the product label carefully. Use the lowest concentration advised on the label. Pay particular attention to the restricted entry interval and do not let anyone have access to the area before that interval is over.
Accidents do happen.
If you suspect that your child has been exposed to a pesticide, remove the child from danger immediately and call Poison Control or your local hospital. If possible, have the product label with you for reference. Do not induce vomiting initially. Doing so may cause more harm depending on the chemical. Stay calm and use common sense.