In ancient Egypt, Taweret was the goddess of fertility, pregnancy, and childbirth. She was worshipped as the patroness of women and children. She is traditionally depicted as a standing, pregnant hippopotamus, often with features of a lion and a crocodile.
People wore these amulets for personal protection during their lives. They were also placed in the grave with the deceased as a symbol of rebirth.
Since Taweret was a household goddess, her amulets were widely used in households rather than in official temples.
 
See last picture as a parallel: https://www.metmuseum.org/art/collection/search/243753