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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).
Eating fish is good for your health and your baby's, but while you are breastfeeding you should have no more than two portions of oily fish a week. A portion is around 140g. Oily fish includes fresh mackerel, sardines, trout and tuna, but not canned tuna, as the good fats are lost in the canning process.