A preterm baby from Cardiff defied the odds of survival when he arrived 4 months early, weighing just 620 grams (1lb 6oz).  Doctors gave home a 5% chance of survival but his parents are thrilled with his progress.  Little baby Kaven was kept in hospital for 5 months and needed 2 operations, one for a serious bowel infection.  Although Kaven is home and progressing well doctors have told his parents that with preemies born this early. other difficulties may emerge.  Kaven's parents are also concerned about a weakness he has on his left side.