You want to know whether the reason for excessive movement and crying that your baby is experiencing pain.
Crying and squirming usually appear when a baby is hungry, need its diapers changed and when something hurts him/her. The cause of the pain usually comes from the abdomen, the throat or the ears.
According to the symptoms you described, squirming, crying and the “knot”, it doesn’t seem that the “knot” is the cause of crying and excessive movement. The “knot” may be a part of the child's sternum or rib.
You might consider seeing a doctor (pediatrician) for further diagnosis of the squirming and the crying. You may request a blood sample to rule out any infection, for example. Please keep in mind that I am not able to diagnose any medical condition online. Please contact a doctor or other healthcare provider such as a pediatrician for further diagnosis and medical treatment.
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