As I am the self proclaimed expert on feeding with shields (lol), I recommend getting the Avent large shields. The Avent ones have a cut out for both nose and chin so that they still work the breast with their chin as they are meant too and they can still smell you .

My LC said to try and get the largest possible so that the baby doesn't get into a bad habit of not opening their mouth wide enough when you want to change back to normal.

My LC had also diagnosed dd1 with a bubble palette, I ended up feeding her for 15 months with the shields. If you can try and feed one side with shield, one side without, that way he doesn't get too use to the feel and will wean off them easy later. Dd1 never weaned because she got use to them and didn't like my nipple (I had to use them longer than I should have though because of the extent of damage, reoccurring mastitis and her palette.

They saved me though. I remember waking up one morning to feed and just crying because I couldn't put her on because of the pain.