Ok, so, I'm raising my very first chicks and I have 2 that are 2 and 3 days old. Well, until now, the younger one has been huddling under the older one and definitely trying to find comfort in the older one. well, today, all of a sudden, the younger one has started pecking at the older one. Of course it doesn't hurt, but it's so small, but is this normal? Are they establishing a pecking order. Will it stop?