I'm exclusively breast feeding baby at 13 weeks and have been expressing to try (unsucessfully ) to get baby to take bottle.in last week I can only get 100 mls from both boobs combined per express sometimes only 50.previous was over 200ml and still dripping out. I'm worried any suggestions? Baby has v small posterior tongue tie but had been growing well 50th centile, wet nappies.I express same small amount whether am or pm, no diet change or new meds. Any ideas?