On relationship between maternal health and congenital malformations.

Abortion, Spontaneous Cardiovascular Diseases/congenital Central Nervous System Diseases/congenital Child, Preschool Clinical Trials as Topic Congenital Abnormalities Electronic Data Processing Female Fetal Death Gastrointestinal Diseases/congenital Humans Infant Infant Mortality Infant, Newborn Maternal Welfare Musculoskeletal Abnormalities Parity Pregnancy Pregnancy Complications Prospective Studies Respiratory Tract Diseases/congenital Skin Diseases/congenital Socioeconomic Factors Urologic Diseases/congenital