Am at my wits end!! I'm returning to work (KiT days) in 3 weeks so have recently started trying DS with expressed BM in a bottle. He absolutely does not want to know 
He has successfully taken a couple of feeds from the bottle but on the whole, he messes about with the teat, then ends up getting cross- at which point he just screams every time the teat goes anywhere near his mouth!
Any advice or tips on how to make the transition?