It's very very normal for many BF babies. Does she seem uncomfortable, thought? She could have a bit of a bug, or it could be nothing - just a glitch!
Has she been nursing well, having lots of wet diapers, as usual?
If she starts to seem uncomfortable, do a warm bath, some tummy massage, bicycle the legs, and if you want, you could even do a rectal thermometer (the stimulation can cause them to poo, and they don't seem to mind - make sure you use vaseline, though). But all that to say: it's normal.
