I have been breastfeeding since birth he was straight on the nipple when he came out. Went well for a couple of weeks but then kept falling asleep and wasn't getting enough I expressed and he was fine on the bottle but refusing nipple more and more. Now he seems to be teething and will put everything in his mouth but now will not go near my nipple. He pulls at my top and bra but as soon as I get it out he turns away. So I'm now expressing all the milk. I've tried nipple shields hours of skin on skin he just will not put it in his mouth. Anyone have any tips. TIA