Feeding Help!!

ASHELEY
I am bottle feeding my son and breast feeding at night and morning, breast feeding was over whelming for me to do all day. My son is 3 weeks 5 days and weighed 7lb 10oz and he is currently eating 4oz every 2 -3.5 hours but lately he is still hungry and really fuzzzy. Am I doing something wrong?? Can you suggest something???