My 7 weeks old sons spits milk whenever he burps I'm breasfeeding?

Pat his back . You must burp him after drinking milk as in pat his back until he burps, otherwise milk gets stuck and he spits up. Another reason for spit up is gastric reflux, with that you need to ask your doctor what medications he/she can prescribe to the baby. Thicker feeds can help, but you must discuss with your doctor how to do that while breastfeeding.