Yep, normal. It's called a 'psuedo menses' (or pseudo period) and is very common, particularly in BF baby girls. It usually only lasts a few days but can last for up to six weeks or so.

Miss P is my second DD but the first I have BF. DH *panicked* when he opened up her nappy and found blood when she was a week or so old. He didn't look particularly comforted when I said, "oh, it's ok darl, she's just having a little period"!!