Sarah Baker (born February 14, 1992) is the fifth child in the Baker family.

Sarah is 11 years old and a tomboy lacrosse lover. She is mischievous and plans pranks on her older sister Nora's boyfriend Hank. Sarah used to call Mark "Fed-Ex" until Mark ran away. She is grounded for fighting at school and slacking on her chores. Sarah shared a room with Kim and Jessica, but when they moved she got her own room. At their new neighbor Dylan's birthday party, she is seen being chased around on a bouncy castle by her father.

Sarah Baker is played by Alyson Stoner.