"Jaw movements" refers to the various ways in which the lower part of your face, known as your jaw, can move. It includes actions like opening and closing your mouth, chewing, and talking. Full definition
In fact the number of teeth required and jaw movements necessary to process various textures do not really develop until sometime around and after 24 months to 30 months of age. (mommyedition.com)
I didn't see much jaw movement, and I didn't hear any swallowing. (nourishconsulting.net)
So, it's important to keep baby awake and encourage her to keep sucking and swallowing (looks like big jaw movement). (fitpregnancy.com)