The series on Liverpool's Alder Hey children's hospital begins a run of twice-weekly visits.
Tonight a four-year-old haemophilia A sufferer who has an operation that will change his life, plus an update on one-year-old Kieran [text removed]'s treatment for cancer of the liver.
See today's choices.
The next programme is tomorrow at 8pm
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Alder Hey: it's been a privilege: page 27