I am going back to work in just over 3 weeks. I am a teacher and am back for a week then have the xmas hols. I have exclusively breastfed dd (19wks). I can express no more than 3oz (max) a day and she has not taken from a bottle. She only will have a couple of oz's from a tommee tippee trainer cup. She is with dad for the week I go back and I am really anxious she will scream the place down with hunger as there wont be enough expressed milk and she will only take couple of oz's from cup. Is it time to introduce formula? Is it time to persevere with a bottle again? any advice would be gratefully received.