ds aged 4.5months has recently started clawing his head to bits. He has lost his birth hair, and tends to have a dry scalp, so we have been moisturising lots, but this hasn't helped, and it has escalated over the past week or so. he seems to do it most when he's tired, so I end up virtually lying in the cot to restrain his hands while he nods off, then he just does it in his sleep and wakes himself up. The poor little mite now has a head full of scratch marks and scabs. I have tried changing creams, in case of allergy, but this has made no difference (and he hasn't got any signs of a skin reaction elsewhere on his body). We are presently using an organic salve based on olive oil, and a moisturing cream containing various essential oils. I'm not keen on using products based on petroleum or paraffin. I haven't tried scratch mitts, because he sucks his fingers so much. Obviously I try to keep his nails trimmed down, but he still manages to draw blood every time.
Any suggestions? Has any other baby done this then just grown out of it? Should I treat it as a skin problem or a behaviour problem, ie is it like twiddling your hair to get to sleep?