You are correct, your cousin should not be rubbing either Vicks or Vaseline into the sensitive skin of a premature infant. She should stop doing this as this is almost certainly the cause of her baby's rash. Babies of this age will wake every 3 hours or so for a feed. The fact that she is waking and crying during the day means that she is probably hungry. It is important to prepare her bottles carefully and in warm weather it is probably best to prepare only one or two bottles at a time.
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