You are enjoying a cup of tea at home. You are a GP oncall for your rural practise. The phone rings. It is the mother of Sarah-Jane Pritchard. You remember this is the baby, born at 28 weeks who was ventilated for 3 weeks but who has otherwise done well. She must now be about 6 months old.
Her mother tells you that her baby has taken only 2 Oz. of milk all day. She also has a tickly cough. She would like you to come and see Sarah-Jane.