Snap, crackle, and pop! LO's joints

Michbot12

I have noticed the last few weeks DD's joints, especially her shoulders, have been cracking like an old lady.  Anyone else have this with their LO?  I usually notice when I burp her on my shoulder.  I am super gentle with her but it still seems to happen.  I plan on asking the pedi but she doesn't go back until 4 months so I'm not sure if it warrants an earlier call/visit.