in italy they reccomend that you start adding a teaspoon of olive oil when you start giving solids. i was very reluctant as my baby started a week before he completed 5months, but hubby (who's italian) was adamant and would supervise me adding it : )))
In india they start at about 6 months.
so if you're convinced, at 7.5months, maybe you can start now. a couple of drops with steamed veggies to start with and then increase, and then gradually introduce butter.