Infant growth faltering is known to occur in breastfed infants <6 months of age. A study, published in Maternal and Child Nutrition assessed whether 1) subclinical mastitis (SCM), 2) maternal intestinal nematode and protozoan infections, indicators of fecal-oral contamination, or 3) poor breastfeeding practices increased the likelihood of stunting (LAZ < -2SD), underweight (WAZ < -2SD) or low head circumference (HCAZ < -2SD) among breastfed infants. In all, 105 mother-infant dyads were categorized as those with and without SCM (milk Na:K ratio > 0.6). SCM was noted in 14% of women and was associated with increased odds of infant stunting (OR=4.3; CI 1.1, 15.8), underweight (OR=9.2; CI 1.8, 48.0) and low head circumference (OR=15.9; CI 2.6, 96.9). Maternal pathogenic protozoa and nematodes were uncommon (<4%); however, non-pathogenic protozoa were common (e.g. Entamoeba coli (39%)). Entamoeba coli increased the chances (OR=3.3; CI 1.02, 10.6) of low head circumference. Higher breastfeeding frequency decreased its odds (OR=0.74, CI 0.56-0.97). It was suggested that prevention of SCM may improve early infant growth. Additionally, public health measures that enhance breastfeeding frequency and reduce fecal-oral contamination may be required to minimize low head circumference.