Hi there,

I can't recommend using your pinky finger to barre the 4th and 5th strings when playing a barre chord. There are some chords that require your pinky to stretch and barre a couple of strings, but I would say, for the purpose of learning and getting into good habbits, it's important to play barre chords with your ring finger and pinky finger each anchored to their respective strings.

Best,

Billy