A typical symptom of salivary gland inflammation is facial swelling and pain in the area where the salivary gland is located:

on the side of the cheeks in front of the ears (parotitis)
under the mandible (submandibular salivary gland inflammation),
on the floor of the mouth (sublingual salivary gland inflammation).
Your baby may have trouble chewing and swallowing food. In order to confirm the diagnosis, an ultrasound examination of the salivary glands is performed. It is a form of diagnostic imaging that is completely safe for a child.