Am I over feeding ?

My LO 6 weeks has been having 120ml bottles every 2-3 ish hours up until a couple of days ago when he began to show signs of hunger after finishing his bottle . I upped his bottle to 150 but he still continues to search for more so I began to offer 180ml which he sometimes drinks or sometimes leaves about 20/30 ml , He does now go 3-4 hours between bottles though. I keep him sat up for about half an hour after each bottle and he’s fine but then I’ll put him down and he will be sick about an hour later . He’s never bothered when he’s sick and it’s never projectile but Im just worried if that is normal or if I’m overfeeding him ?