Hi I'm a first time mum and new to mumsnet so forgive me for not using abbreviations :). My four month old has developed wet looking bright red saw armpit marks deep in her folds. I feel rubbish because I have only just noticed them. I'm guessing I have not been washing and drying them adequately. My problem is when I try to wash her armpits she fights against me she uses all her force to keep her arms by her side's and I'm finding it really difficult to get to her arm pits. I don't want to try to force her arms up as I'm worried I will hurt her. Any ideas how I can get her to lift her arms without such a commotion ?