pain! help!

Mandy ♡ • 3 year old boy & baby girl on the way April 2020 ✧
My right breast seems to be painful after I feed my son. He is 3 weeks old this Friday. It's like a burning/sharp pain in my nipple and deep into my boob. Eventually it goes away but it takes like 20 mins! Sometimes I notice it even if I haven't fed on that side for a while. Any ideas?