Baby eats constantly!

Kristin

My LO(6weeks) eats all the time, it can be 30 minutes after a 2oz bottle and she wants more. I usually feed her 3oz at a time but it's like she can't ever get full enough, she's currently stopped napping within the past few days it's like an act of God to get her to sleep. She's also been constipated. It's like everything is happening all at once what do I do?!