What stage of Piaget's is this?

What stage of Piaget's is this? Kendall and her mother play a game where they touch each other's noses and giggle. Kendall's mother touches her nose, and then Kendall touches her mother's nose. One time, Kendall's mother places a handkerchief between her face and Kendall's face. Kendall swipes the handkerchief away with one hand and touches her mother's face with the other.