Thanks for your question. Large quantities of phlegm in the throat, can cause vomiting, simply by irritating the soft palate, causing gagging and triggering the vomiting reflex. Toddlers, unlike adults, do not know that they should spit up the phlegm, so they end up swallowing it. Vomiting is the only way for their bodies to expel the accumulated phlegm. The other way for it to go out of the body is through the child’s stool.
A possible ear infection, or chest/sinus infection may be beginning in your son. You should consider taking him to the pediatrician so they can look in his ears and listen to his chest. Is the phlegm yellow or green in color?
