If you have/had a sleepy newborn, what was your take on waking to eat? Yes during the day and no at night? Never?

C is 2 weeks old. At her appt on Thursday she was less than 2 ounces from her birth weight so she is probably back up to it by now. She is a champion sleeper some days- like this morning she are from 7:30-8:30 and is still sleeping, at 11. She's been grunting and moving around so I thought she was waking up but when I tried to feed her she's just not interested. If I strip her or change her diaper shell probably wake up. What did you do with your sleepy baby. Did waking her more during the day help with longer stretches at night? I'm also breast feeding and stil establishing supply.