Sleepy baby

Hi my 1 week old baby is always sleepy. I actually had difficulties waking her up every 3 hours for milk. Even when I remove her swaddle, changed her diaper; she’ll just go back to sleep immediately. Even if i managed to let her latch, she’ll fall asleep within 2 minutes. But she pee and/or poop every feed (3hours). My concern is she isnt getting enough milk as I can feel my breast getting softer as day goes by (probably due to the lack of “demand” from my baby).