Moos, I left our twins with a minder from 7m and they had never had a bottle really. She managed miraculously to persuade them... by virtue of some rocking, holding in a very firm snuggly grip etc. Getting a bottle (axifeed storage bottle) that you can squeeze slightly to push the milk out and reduce the need to suck might be a help. I have a few such bottles if you'd like one. Also best probably to try these feeds NOT when he's tired, and not when you're there listening getting stressed