Piggy in a Crib is an idiom that refers to a baby being taken care of and protected. The term is derived from the nursery rhyme 'This Little Piggy' which is about a mother pig putting her five little piglets to bed in a crib. TOE, the 3 letter solution to this crossword, is a part of the body found at the end of the foot. It is used for balance and movement and is made up of bones, muscles, and ligaments.