My 7-month has started latching on to only my nipple area and pulling/stretching it while nursing. She started doing this at about 6-months, her latch went back to normal, but now she's doing it again. She also puts her hand on me and pushes away while she's still latched on. Sometimes this breaks her latch and she gets upset but then she does the same thing again. Does this have something to do with teething? Any advice on how to correct it? I try breaking her latch then offering more of the breast but she just keeps doing the same thing.