Lambs are young sheep. Their meat is considered full of nutrients. Lamb, mutton, and hogget are the meat of domestic sheep at different ages. In its first year sheep is called a lamb, and its meat is also called lamb. The meat of a juvenile sheep is older than one year and is called a hogget. Adult sheep’s meat is mutton, a term only used for the meat, not the living animals. Lambs require good care especially when they are born.