My baby did this standing up.
Little babies are the happiest and the cutest! My daughter did this in a very loud birthday party with music. She was dancing (in a way only a toddler can do) and smiling and giggling and the next instant, her eyes half closed and she fell asleep while standing up. I had to catch her as she fell over. Cherish these little guys and each moment. They grow up so fast.
Credit to bobaepapa channel.