A girl's size 14 is designed for a girl who is 60 to 62 inches in height with a 32-inch bust, a 26.5-inch waist and 34.5-inch hips. This is equivalent to a juniors' size 1 or 3.
In general, girls' clothing is designed for the more childlike body of younger girls, whereas juniors' clothing is designed to accommodate the more hourglass-shaped body of a developing teenager. Clothing in the juniors' section is often trendier and may be tighter fitting and more revealing than clothing in the girls' section. In addition, juniors' pants are often longer than the equivalent girls' size.