Better to use mild and gentle baby massage oil which is made of natural ingredients like Moms Co natural baby massage oil which is a combination of 10 powerful oil which helps to strengthen your baby bones and muscles

I will suggest you to use Mamaearth baby massage oil its clinically proven, it's safe natural and chemical free.

BHT is recognized as safe to an extent and depends on the concentration amount, it is said to be safe. But you can always use coconut oil.