Both acculturation and poverty have roles in children's diets and in household food insufficiency. Culturally specific public health and nutrition education should complement efforts to improve the financial security of low-income households.

Several reviews and meta-analyses have examined the effects of iodine on mental development. None focused on young children, so they were incomplete in summarizing the effects on this important age group. The current systematic review therefore examined the relationship between iodine and mental development of children 5 years old and under. A systematic review of articles using Medline (1980–November 2011) was carried out. We organized studies according to four designs: (1) randomized controlled trial with iodine supplementation of mothers; (2) non-randomized trial with iodine supplementation of mothers and/or infants; (3) prospective cohort study stratified by pregnant women’s iodine status; (4) prospective cohort study stratified by newborn iodine status. Average effect sizes for these four designs were 0.68 (2 RCT studies), 0.46 (8 non-RCT studies), 0.52 (9 cohort stratified by mothers’ iodine status), and 0.54 (4 cohort stratified by infants’ iodine status). This translates into 6.9 to 10.2 IQ points lower in iodine deficient children compared with iodine replete children. Thus, regardless of study design, iodine deficiency had a substantial impact on mental development. Methodological concerns included weak study designs, the omission of important confounders, small sample sizes, the lack of cluster analyses, and the lack of separate analyses of verbal and non-verbal subtests. Quantifying more precisely the contribution of iodine deficiency to delayed mental development in young children requires more well-designed randomized controlled trials, including ones on the role of iodized salt.

The negative association between breastfeeding and linear growth reflected reverse causality. Increased breastfeeding did not lead to poor growth; children's poor growth and health led to increased breastfeeding. Children's health must be considered when evaluating the association of breastfeeding with anthropometric outcomes.

We used direct observer techniques to measure the frequency with which toddler-aged children were contaminated by poultry feces in homes in a peri-urban shanty town in Lima, Peru. The mean number of fowl was 5.4 (SD 3.1), with 10.0 (SD 10.7) poultry defecations per 12 hours. Toddlers' hand contact with poultry feces occurred a mean of 2.9 (SD 3.0) times/12 hours. A mean of 3.9 (SD 4.6) feces-to-mouth episodes per household/12 hours occurred both by direct hand-to-mouth contamination and indirectly by handling soiled objects which were then placed in the mouth. There was a strong correlation between feces-to-hand contamination and feces-to-mouth contamination (r = 0.94). There was also an IntroductionDiarrheal disease is an important factor in the infectionmalnutrition cycle of infants and young children in developing countries. In Peru, children under three years of age have a diarrheal incidence of 10 episodes per child-year, which can significantly affect their growth rates.' One important cause of diarrhea in Lima children less than one year of age is

To gain perspective on breastfeeding initiation and duration among poor women in the southeastern United States, the authors interviewed a random sample of 150 mothers (93% African American) at a county health clinic in Birmingham, Alabama. Forty-one percent of women initiated breastfeeding, 24% breastfed for at least 1 month, and 8.3% breastfed for 3 months or more. Initiation of breastfeeding was positively associated with the mother having been breastfed herself and having breastfed a previous infant, and negatively associated with premature delivery. Breastfeeding at 1 month was more likely among older women and women with close relatives who breastfed. Duration of breastfeeding beyond 1 month was associated only with the mother having been breastfed and having breastfed a previous infant. Maternal and familial breastfeeding experiences eliminated the effect of more distal factors, such as income or education, on some feeding decisions. The strong influence of breastfeeding experiences must be considered in infant feeding interventions.