I'm selling this because I received it but don't use it. ◯ Size: Main body (approx.) 28.5cm wide x 16cm long ◯ How to use: Put your arm through the rubber band on the back of the pillow, hold the baby, and place their head on the arm pillow. The center of the dinosaur is indented, making it easy for the baby's head to fit. It reduces the burden on the baby's neck and prevents numbness in the mother's arm when holding the baby for a long time.