Growing Fast!

Layla had her 2 week weight check-up today. She was 8 lbs 1.9 oz at birth, she came home at 7 lbs 9 oz, and last Tuesday at her check-up she was 8 lbs 0.5 oz. Today she tipped the scale at 9 lbs 6 oz! She's a growing girl! She's also graduated out of the newborn diapers, and into the size ones. Truthfully, the newborns still fit her, but we ran out and didn't want to buy more since the size ones supposedly fit starting at 8 pounds. How did she get so big so quickly?!?!?