Flat spot - helmet

So my baby has a flat spot on one side of her head. She favors that side when she sleeps. She had an appointment and there are zero medical concerns and it’s mild. They said we could decide if we wanted to wait 8 weeks to see if it starts to correct itself or if we wanted to go the helmet route. Since there are no medical concerns and it would just be for cosmetic reasons would you do a helmet or just wait and see? Anyones baby had a flat spot correct itself on its own?