DD will be six months old on April 3rd, lately when she nurses she hits herself in the head repeatedly while nursing (like she is moving her hand back and forth and happens to hit her head). She also tugs on her hair while nursing. Is this normal at all? Should I be concerned? She twiddles a little bit and I have a nursing necklace, but she is easily distracted right now and she tends to stop nursing in order to look at the necklace.