I had a similar prob, though evie was about 8 months when it became an issue. She wouldnt feed much during the day but keep waking up all night. like she was thinking 'i'd rather feed at night when i can have special hugs with mum than during the day when there's far too much to do!' i just started slowly (like over a couple of weeks) cutting down the length of time that i fed at night for. for example, i went from 6mins to 5 mins for 4 nights then 4 mins for 4 nights etc...or how ever long you need to. If you can do that then she might start feeding more during the day and not relying on the night feed to fill up.
Above all else, dont stress about it, they change so much in that first year that what works one day doesnt work the next day/week/month etc. in a couple of months you'll be thinking..huh? i dont remember any of that.
Hope that helps and good luck