<prompt> All are unique features of WHO growth chas 2006 exceptBreast fed infants as normative growth modelSample collection from 6 states in the USIncludes new indicators such as skinfold thicknessReiterates children grow similarly all over the world.  <response>: WHO growth chas are based on multicentre growth reference study MGRS conducted in 6 countries all over the world. Brazil Norway Ghana Oman US India Ref: Nelsons ,20th edition, Page 84-89 