There's a lot of stuff you can use as long as it creates a barrier on the skin. Like an oil. You know when you see ducks in water and they splash water on themselves and the water just beads off cuz they have oil on their feathers? I'm going to mix some organic almond oil and Shea butter with a little bit of avocado oil probably. Any natural oil should do. As long as it's free of chemicals your baby should be fine.