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ASK THE EXPERT:It's hard to know why very small babies cry, except that it is in many ways a sign of bonding and security, writes David Coleman

WE HAVE an 18-week-old baby. He has been in and out of hospital since birth and his last admission was at 10 weeks old when he was taken critically ill. He is now home, and apart from having to do physiotherapy at home and in hospital and having lots of hospital appointments, he is well.