Does prenatal cadmium exposure affect fetal and child growth?
- 1Department of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK
- 2Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University College of Public Health, Taipei, Taiwan
- Correspondence to Professor Pat Doyle, Department of Epidemiology and Population, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK;
- Received 20 July 2010
- Revised 8 November 2010
- Accepted 15 November 2010
- Published Online First 23 December 2010
Objectives Cadmium is known to be a significant health hazard, but most information comes from studies of adults. The effects of exposure to cadmium during fetal life on early growth and development remain uncertain. In this study we investigated the placental transport of cadmium and the effects of prenatal cadmium exposure on fetal and child growth in Taiwan.
Methods The data in this study were from a birth cohort study in Taiwan which started in 2004. Pregnant women were recruited from four hospitals and interviewed after delivery to collect information on themselves and their infants. Children were followed up to obtain information on growth up to 3 years of age. Whole blood cadmium concentrations in maternal and cord blood samples were measured and the relationship with birth size and growth assessed using linear regression and mixed models.
Results 321 maternal blood samples and 402 cord blood samples were eligible for analysis. Among 289 pairs with maternal and cord blood suitable for measurement, the median cadmium concentration in cord blood (0.31 μg/l) was less than that in maternal blood (1.05 μg/l), with low correlation between the two (r=0.04). An increase in cord blood cadmium was found to be associated with newborn decreased head circumference and to be significantly and consistently associated with a decrease in height, weight and head circumference up to 3 years of age.
Conclusions Placental transport of cadmium is limited. However, prenatal cadmium exposure may have a detrimental effect on head circumference at birth and child growth in the first 3 years of life.
Funding This study was partly supported by grants from the Bureau of Health Promotion, Department of Health (BHP-PHRC-92-4 and DOH93-HP-1702) and the National Science Council (NSC95-2314-B-002-269 and NSC96-2314-B-002-117-MY3), Taiwan. The funders had no role in the design, conduct or analysis of this study.
Competing interests None.
Ethics approval This study was conducted with the approval of the Ethics Committee of the National Taiwan University Hospital.
Provenance and peer review Not commissioned; externally peer reviewed.