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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).
However, breastfeeding mothers should pay attention to the preparation of the sushi they are eating. They should go to restaurants who only use flash-frozen fish for their sushi, and only order sushi and sashimi made of fish low in mercury. If you are a sushi-lover, the hardest thing about pregnancy will be the diet.