Baby is constantly switching sides to nurse - normal/ok?

ebp913

My daughter (7 months) is constantly switching sides when she nurses and has been for the last few weeks.  She will latch on for 5-10 seconds then want to switch to the other side and this goes on and on for 10-15 minutes.  Over time she does empty my breast but it's just that she's always going back and forth. 

I am wondering if I am part of the problem (if it even is a problem) here in that I "let" her do it.  She will come off one side and pull and pull on my shirt on the other side until I let her nurse that one so it's not like I am trying to make this happen but I wonder if I shouldn't stop the nursing session and wait until she is really ready to focus. 

This doesn't happen so much at her first morning session in the morning or if she wakes during the night.  It's just her 2 nighttime nursing sessions.  If it matters, I work 8-5, nurse in the morning and twice at night and she takes pumped milk at daycare.  What do y'all think?  Is this an issue that I need to stop?  Could it cause problems with foremilk/hindmilk?