Guidelines for safe use of essential oils:
• Essential oils are not recommended for oral use.
• Always store essential oil bottles out of reach of children.
• Never apply undiluted essential oil to the skin; dilute essential oils in a carrier oil before applying to the skin to prevent skin irritations; though Lavender can be applied undiluted to burns, cuts and insect bites.
• Use extreme care not to get the essential oils (even in diluted form) or vapour in the eyes. If this occurs, flush the eyes immediately with cool water.
• Many essential oils should not be used during pregnancy due to the stimulating effect they have on the uterus and urinary system.
• When using citrus, phototoxic essential oils, you should avoid going out into the sun, sunbathing, sauna and steam rooms and solariums for at least 4 hours.
• Essential oils should be stored in amber or cobalt blue glass bottles in a cool dark place to avoid deterioration by light and heat. Keep the bottles tightly shut to prevent evaporation and oxidisation.

Essential oils and Pregnancy
Some essential oils should not be used during pregnancy due to the stimulating effect they have on the uterus and urinary system. See following here.

Essential oils best avoided during pregnancy: Basil Carrot Seed Cedarwood Clary sage Cypress Eucalyptus Fennel Geranium Ginger Jasmine Juniper Lemongrass Marjoram Myrhh Peppermint Rose Otto Rosemary Sage Thyme Vetiver

Essential oils that can be used after the first trimester pregnancy: Bergamot Black Pepper Chamomile German Chamomile Roman Frankincense Grapefruit Lavender Lemon Lime Mandarin Neroli Orange Palmarosa Patchouli Petitgrain Pine Rose maroc Rosewood Sandalwood Tea Tree Ylang ylang