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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).
1 Essential oils are typically applied topically in a carrier oil. When you are using an oil around an infant, a 1% dilution (or less) is preferred.  Apply essential oils to yourself after breastfeeding. This gives them time to be used by your body before being passed on to your baby.