I posted a long, overly detailed description, and then tried it on Sadie. I over analyzed how I do it, and it doesn't work that way.
I'll just add to what Chloe's Mommy said.

I'll just add to what Chloe's Mommy said.
Tilt his head back while you do this. It give you the advantage of gravity and opens the throat. And hold his mouth close till he swallows.
