I have a four month old Nubian Alpine cross doeling whose horns are barely growing (we don't dehorn). They're only about half an inch long. She's in perfect health plenty to eat, mineral, etc. Her brother (same kidding) has horns close to an inch and a half long, as do all my kids from this spring. I doubt it's any cause for concern, but I'm a little stumped. Has anyone encountered this before?