These are Ibeji statues from the Yoruba people in Nigeria. They believe that twins share one soul. If one twin dies and goes to the spirit world, then the living twin is in danger. Mom has to go to a diviner and commission an Ibeji for her dead child. For the rest of her life, she must feed, take care of, make sacrifices to, and love the statue like her child. This keeps her dead child in the spirit world happy. This way, the living child’s soul remains intact.