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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 Dried fennel seeds are generally considered safe. So safe in fact that diluted fennel seed tea is often recommended as a treatment for colic in babies.  As is common with most potent herbal products, fennel seed is not recommended for pregnant or breastfeeding women.