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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).
During pregnancy, there is heightened sensitivity so we might use a little less of the oils but they can be used very effectively. In pregnancy, we are very protective about what we put into our body. We should have confidence in the oils through pregnancy and while breastfeeding.