7.7% had one sister having CHD; 69.3% were the first child of the family; 69.3% were Cesarean delivered; average birth weight was 2800 gram; 15% were preterm; 38.4% were detected CHD at 1 month old, no case was detected after 12 months old; only 15% of them were diagnosed at the first time of examination; 38% had to hospitalize many times.