Add coconut oil, shea butter and beeswax to a double boiler (on medium heat).*
Once coconut oil, shea butter and beeswax have melted, remove from heat and let sit for 5 min.
Add zinc oxide and stir (really) well.
Add lavender essential oil. Stir again.
Use a spatula and scrape the mixture into a glass container with a lid.
*To make a double boiler, place a half-full pot of water on medium heat. Add beeswax, coconut oil and shea butter to a stainless steel bowl and place on top of the pot.
*Beeswax is really difficult to clean. I recommend using the boiled water from your double boiler and pouring it into the bowl you used to make the cream. Then dump the water, wipe the bowl (and utensils) with some paper towel to soak up most of the beeswax/oils, then wash with hot, soapy water.
*You should use a scoop or a spoon to scoop it out (not your fingers) and either wash it or discard it after using and use a new one next time - using your fingers can add bacteria to the cream.
*Recipe makes about 3 oz (90 ml) of diaper cream.