Is part of Al Qudra Man- Made Lakes - a famous site in the Al Marmoum Conservation Area in Dubai. anyone wanna join my zooom class

Chen's research team randomly assigned some newborns and their mothers either to a breastfeeding promotion group (where breastfeeding was encouraged, but not required) or to a normal pediatric care group (where breastfeeding was neither encouraged nor discouraged). which research method did they use?