LO has little scratches on her head from her scratching herself when she's nursing or playing. I think she does it for comfort, but now she has these slightly bloody scratch marks on her head (she doesn't have much hair). I try and keep her nails short but it doesn't always help. Mittens don't work (they fall off) and I could put a hat on. Anyone else's LO do this? Did they outgrow it? LO is almost 4 months.