Baby likes to be fed flat on back!!

Missy Moo

Help!! For the last 2 months my bottle fed 5 month old will only drink when he's lying flat on his back.

I googled about it and it said it's bad it will make babies get ear infections. Sometimes babies do it because of an ear infection but my son doesn't show any signs of distress with his ears? Does anyone else's baby like to drink this way? Will it effect his ability to eat solids in future??