Studies looking at newborn ear deformities have shown that approximately 1/3 of mild ear deformities improve or resolve without intervention in the first week after birth, and 2/3 of all protruding ears or deformities will remain the same or worsen with time.  Ears that are either compressed or folded at birth can naturally unfold and regain a more normal shape, but ears that appear persistently protruding or deformed beyond the first week of life are unlikely to get better on their own, and may benefit from ear molding.