13 days old and

My baby is 13 days old and is formula fed I had him on 2 oz every 2-3 hours but he wanted more so I gave him 3 oz then he lasted till about 3-4 hours but now he throw up a lot like he spits up it’s obviously bc he’s over eating idk what to do I try and hold him off longer then 3 hrs but he doesn’t last he wants to eat but then he spits up I’m so frustrated and worried what am I doing wrong I burp him a lot give him the paci nothing works he wants milk on time and so much

Help please !!!????