Baird, P.A. - University of British Columbia - Centre for Health … - 1999
Birth defects occur in population in 3-5% of births. All those birth defects due to chromosomal errors, hundreds of … likely to be carrying a fetus with a birth defect except in a few instances, namely: -Down syndrome, -neural tube defect, -a … previous history in the family of a particular defect and - a history in sub-population of a high birth incidence of a …