My 16 mo. old is really being pesky when we nurse. My biggest complaint is when she jabs her thumb into my navel. I hate the feeling SO much. And her nails are sharp. I've tried moving her arm and saying stop -- I've even made it a point to have her kitty blanket between us but, she gets angry. She also sratches my side and gets angry when I don't have a letdown fast enough. UGH. I'm really tired of nursing her. It's not comfortable anymore. Any advice?