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One of the safest oils for a breastfeeding mother to use is lavender (Lavandula angustifolia). Other oils that may be considered are geranium (Pelargonium graveolens), Roman chamomile (Chamaemelum nobile), and fennel (Foeniculum vulgare var. dulce).
Diffusing essential oil is another wonderful way to experience the benefits of these oils. With high quality brands like Young Living, only 2 drops are needed for a diffusing session. Do not ingest essential oils while pregnant or breastfeeding.