It's always good to see ur LO mouth after eating, my LO always open mouth and shout etc, hence can fee whether there is anything in his mouth or not.
And they will tend to move their mouth when they have sth inside in their mouth so i will check his mouth, incase he pick up anything to put in his mouth like toys or watever he can find.
They may not have food but other things in their mouth instead. So good to monitor their mouth behavior.
Read more