Need advice on what could be the issue with my baby...

* She gets comfort immediately from nursing

* She's content after nursing for maybe 5 min and then starts crying. I try to soothe her by rocking her and sometimes she goes to sleep. Sometimes she doesn't so I go back to nursing her and it's a never ending cycle.

Is this a sign of comfort nursing?? Or maybe cluster feeding?

I'm using a nipple shield and sometimes there's milk still inside on my nipple or it drains from her mouth making me think she's not really eating most of it..

My baby is 1 month.