List of Safe Essential Oils for Children: For ages 0-6 months: Valerie Ann Worwood, an aroma therapist, herbalist and author of “The Complete Book of Essential Oils & Aromatherapy“, notes that chamomile and lavender are safe to use on newborns and above ages [6] . For ages 6 months and older: Add calendula, grapefruit, mandarin, and tea tree oil to the acceptable list of essential oils at this age [6] .