Big Baby from Toy Story 3 is referred to as a "baby doll" and is therefore generally considered to be neither specifically a boy nor a girl.
While the term "baby doll" might evoke images of female dolls for some, Big Baby's character design is intentionally ambiguous regarding gender. The defining characteristic is that he's a baby doll, not a representation of a specific gender. He’s a large doll resembling an infant.
