Rocco is teething really hard. Today seemed to be a particularly bad day. I've noticed something he does and I was wondering if anyone elses' LO does it. I'm sure it's normal, I'm just wondering when he chews on something to relieve the teething pain, he bites down so hard, he shakes for a second. Like if you're trying to lift something really heavy and your muscles shake, or if you're trying to get the lid of a jar open that's really tight, your arm will shake. I gave him a bottle with cold water in it hoping it would feel good on his gums. It must have because he would tilt the bottle back so the nipple would fill with water but then just bite on it. So hard that he would shake!! He does it when he chews on my knuckles too.