Hi mummy claire,
I've just tried training my daughter to drink EBM from bottle as I'm going to work soon. Similarly, there is a lot of tantrums, crying, playing with the milk till most of it goes on her face or her clothes. But something worked today! I gave her the bottle while she's lying down. Get something to distract her like a toy and suddenly she's drinking! She managed to finish one whole feed. And probably cos she's hungry and finds that it's no use fighting back since mummy's milk tastes so good. hehe. : )
I think getting your child in a comfy position like lying down might work. Since he's squirming about when you carry him, it'll be hard for him to take in the bottle. Hope it work's well for you!