There are so many brands of essential oils in the market. How do I choose one that is safe to use on my child?

Plant Therapy has line that's child-friendly called "KidSafe". They have individual oils (lavender, lemon etc) and they also have "synergies" which are concoctions or mixtures for different needs like "Eczema Helper", "Calm The Child". Moreover, they have free shipping to Singapore! http://www.planttherapy.com/essential-oils-for-kids