The size 8 years in American Apparel is closest to the following:
Brand Label Weight (lbs) Height (inches)
American Apparel 8 years 49 - 52 lbs 48 - 50 inches
Burt's Bees Baby (Target) 7 53 lbs 48 - 51.5 inches
Cherokee (Target) 7 48.5 - 54 lbs 47 - 48.5 inches
Circo (Target) 7 48.5 - 54 lbs 47 - 48.5 inches
H&M 6-7 years - 48 inches
Hanna Andersson 120cm 45 - 55 lbs 46 - 50 inches
Hatley 7 - 50 inches
J.Crew/ Crewcuts 6 46.5 - 54.5 lbs 45 - 49 inches
LLBean 8/S - 49 - 52 inches
Lands End 7/L 49 - 54 lbs 47 - 49 inches
Marimekko 7 yrs/ 122 cm - 48 inches
MiniBoden 7y - 48 inches
Petit Bateau 10Y 48 - 53 lbs 54.5 inches
Ralph Lauren 7 49 - 55 lbs 49 - 51.5 inches
janie and jack 5 40 - 44 lbs 44 - 52 inches
tea 6/M 46 - 51 lbs 45 - 48 inches