I noticed my son huge a huge bubble come out of his mouth and it was really slimey

Tamara • Mommy to my 2 beautiful baby boys, Nathan Louis💙 born August 12, 2017 and Parker Joseph May 6, 2019❤️ My whole world😍

This was after I gave him his vitamin d.

Is this something I should be worried about?

He keeps choking on his saliva