Easy essential oil dilution guide for filling roller ball containers for all ages. To get fractions of drops, combine in a different container and split the mix between 2-3 containers. Not sure about the source so adjust as needed but this is a good starting point.
Some essential oils are not safe before a certain age no matter the brand simply because of the compounds they contain. Here is a list of essential oils with Age Restrictions. Included on this chart updated 6/26/15 are warnings on respiratory issues, blood issues, dermal applications and hazardous oils for all ages.