warm water, then squeeze it out so its not wet. put the warm flannel on your little ones neck and then put the ice (bags of frozen peas work great) on their neck. they can lay on it if its easier.
about 15 minutes will be really helpful for pain, although for such young ones 15 minutes of laying still is like 2 hours for an adult, so maybe right before they fall asleep at night will work. ice takes the pain down a lot and can really help.
also, ice on the knee will help a lot, right away, sit with your whole leg resting on a couch or bed, small 