My 6th baby clicked while nursing. My nipples were very painful. I had been working with breastfeeding mothers for 15 plus years, was an IBCLC and had successfully breastfed 5 other children. Thanks to Chele Marmet, she discovered he had food allergies to some things I was eating. He was four months old at the time. His palate was itchy and he scratched it with his tongue. Shortly after I removed the offending foods from my diet the clicking stopped and the nipple pain disappeared. Ruth Solomon