Each hatchling has their own set of adorable outfits. The best part about them is that each outfit you unlock gives you a permanent coin bonus to the end of each level. The more outfits you have unlocked for your hatchlings, the more coins you'll earn! Each hatchling has two outfits you can buy with coins, but the others must be found from the chests. It's expensive initially, but you'll be earning lots of coins in the long run!