My previously very chilled out DD is 2 months old. After a hospital stay 1.5 weeks ago she has developed a habit of hysterical screaming when laid in her back to change (I have never seen a baby cry like this my first daughter never did). I can not work out what is triggering it - can a baby have PTSD?. In hospital she had to have a lumbar puncture performed. The nurses advised me not to stay as they said it was unpleasant and they wouldn't want to see their own child have one - so I waited outside but heard her screaming for what felt like an eternity. The other thing is she has had a clickey hip, which we are waiting for a follow up scan for to see if there is any improvement. If any one has any ideas what could be triggering her screaming or any advice as to what I can do to help her or work out the cause of this I would be eternally grateful :(