Pregnant/New Mamas in particular. This is such an exciting time in your life - or in the life of someone you know/love. Awhile back I did a series of posts on this very subject but I just caught wind of another slew of data that might be helpful. Abundant Health has a helpful section - Essential Oil Care for Pregnancy and Motherhood that can be a wonderful resource.
Make sure you reference my First Aid Kit post for other needs (outside of pregnancy).