1. Have a healthy meal before. Give them a healthy dinner before they head out for trick or treating – don’t send them out on an empty stomach.
  2. Inspect the treats before they eat. Tell children not to accept – and especially not to eat – anything that isn’t commercially wrapped. Inspect all treats for signs of tampering, such as an unusual appearance or discoloration, tiny pinholes, or tears in wrappers. Throw away anything that looks suspicious.
  3. Food allergies? Read the labels first. If your child has a food allergy, check the label to ensure the allergen isn’t present. Do not allow them to ingest any home-baked goods they may have received.
  4. Check for choking hazards. If you have young children, be sure to remove any choking hazards such as gum, peanuts, hard candies, or small toys.
  1. Give a treat allowance. Try to ration treats for the days and weeks following Halloween to avoid unhealthy consumption.
Sources

https://www.fda.gov/food/resourcesforyou/consumers/ucm187021.htm