Milk production help!!

Kristin • Engaged to an amazing man ❤i have a boy and a girl he has a son. we had our first together 10/1/16 Kendall Jean💖💜💙
My baby is 3 weeks old today and I haven't to uncle pumping 2 Oz every 2 hours!! I am only pumping, she doesn't really like the boob, so just pumping.. I need help producing more milk!!!