The size 8Y in Petit Bateau 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) 6 48 lbs 45 - 47.5 inches
Cherokee (Target) 6 42 - 48 lbs 45.5 - 46.5 inches
Circo (Target) 6 42 - 48 lbs 45.5 - 46.5 inches
Gap 5T 40 - 46 lbs 42 - 45 inches
Gymboree 5T 41 - 46 lbs 42 - 45 inches
H&M 7-8 years - 50 inches
Hanna Andersson 120cm 45 - 55 lbs 46 - 50 inches
Hatley 7 - 50 inches
J.Crew/ Crewcuts 5 39.5 - 46.5 lbs 42 - 45 inches
LLBean 8/S - 49 - 52 inches
Lands End 6/ M 42 - 48 lbs 46 - 47 inches
Marimekko 7 yrs/ 122 cm - 48 inches
MiniBoden 8y - 50.5 inches
Old Navy 5T 40 - 46 lbs 42 - 45 inches
Petit Bateau 8Y 43 - 47 lbs 49.5 inches
Ralph Lauren 6 45 - 49 lbs 46 - 48.5 inches
Tucker + Tate (Nordstrom) 5T 39 - 44 lbs 42 - 44.5 inches
janie and jack 5 40 - 44 lbs 44 - 52 inches
tea 6/M 46 - 51 lbs 45 - 48 inches