Baby spit up/throw up

Lesss

I’m a FTM, before if always watch babies and after feeding it’s normal to burp them otherwise they’ll spit up a little. However, lately my son who’s about to be 3 weeks old, has been constantly throwing up immediately after feeding and even after hours of already having been fed. I am breastfeeding only, and it’s not small spit ups, it’s literally him throwing up streams of milk ... has anyone else experienced the same with their little ones ?