how to handle a really puky newborn

Okay so I watch a baby everyday. Baby is 2 weeks old, he drinks 2-3  ounces every 2 hours. He just had like a cheap bottle from dollar general and I figured that wasn't helping anything. He would puke so much after his meals so I talked with mom and started burping him every half ounce and started using a doctor brown bottle.  So far that has really helped but he still pukes. What else do you think I should do? I thought about the nipple being too fast so I got him a slower one. 
Still pukey. He is on gerber gentle formula.
Burp him every half ounce, got a better bottle and nipple. His older sister was exactly like this but she stopped puking when we started using doctor brown bottles. I didn't have his sister this early though.