Neither did I til one time I stole a baby (with consent of course, parent was having trouble settling it and was getting a bit flustered as they couldn't leave the area due to a slightly older child who was in a class having anxiety issues) and was outside in the foyer rocking this angry little thing to sleep and a friend was with me also clucking over the baby and chatting to me and then we both noticed that they were swaying in time with me as I was rocking the baby XD