A friend of mine was cautioned against using a diffuser and essential oils because her child is asthmatic. The diffusion might aggravate her child's asthma and affect the breathing. It is also important to not use essential oils neat (not diluted) directly on baby and a young child's skin. Some oils are really concentrated and can "burn" a young child's delicate skin.
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i used mainly with a diffuser. Applying only during high fever with lemon essential oils.