At 4-6 weeks he would take a bottle no problem but now (11wks) he gets really upset when I (or my partner) try to give him a bottle. I have tried a fast flow teat this morning but he just gets upset. I am using Tommee Tippee bottles. I use nipple shields so technically it shouldn't be that different a feeling in his mouth should it? I don't mind trying different bottles but it could end up costing me a fortune! I would really like him to have the odd BEM so I can have a rest occasionally. Any suggestions?