my work colleague and I have noticed a child in our care, female aged 3, is regularly displaying what we can only call "grinding" moves. when she is laying down for her mid day nap, or laying on her tummy to be involved in a group carpet time activity, or sitting upright with her legs out at 90 degrees so her knees are touching together, these actions are visible. To our knowledge she isn't suffering from any urine infections (parents havnt advised of this). Is there anyone out there who may be able to give advice , or explanation for this ? thank you for taking the time to read this