I am sorry, but I did not read the original post on clamping babies, comment posts thereafter. I agree with Linda that birth interventions can play a big role in intraoral hypertonicity. Interventions can wreak havoc with proper structural alignment of the cranium to the sacrum and therfore affect the nerves. Another possibility is allergy which works by creating gastrointestinal pain (a stressor) which fires off the sympathetic nervous system which in turn causes jaw clenching. I would suggest you take a thourough allergy history (especially find out if mom is eating alot of dairy products) then get this kid lots of skin-to-skin contact while you figure out what is causing the problem. Sometimes clamping is from short/tight labial or lingual frenula and sometimes it is because the tongue is not able to maintain a good seal (hypotonic or flaccid tongue) and so the baby clamps to maintain a grasp of the nipple as a compensation. Any strategy that will get this baby to calm down will be helpful. I would also minimize any other stimuli: lights, noise, excessive rocking or touching until you find out the cause. Hope this helps and is not too redundant! Alison K. Hazelbaker