Spitting up a fair amount after most feeds is common at this age, since your baby's valve between the stomach and food pipe is still immature. The curdled look just means the milk has partly digested, which on its own is not a worry.
Next Steps
Try smaller, more frequent feeds, burp him well halfway through and again after each feed, and hold him upright for 20 to 30 minutes afterward. Avoid laying him flat right after a feed.
Health Tips
See your paediatrician if he is not gaining weight well, the spit-up turns forceful or green, or he seems in pain or breathless.