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Abstract Background Early childhood caries poses a significant health issue in children under 6 years old. It is determined that Streptococcus mutans is a primary etiological agent, likely to be transferred through maternal contact. Objectives To determine the association of maternal S. mutans counts with S. mutans counts in their children between 6 and 30 months of age, and to determine the maternal and child DMFT (decayed, missing, and filled teeth) indices. Material and Methods A community‐based cross‐sectional study was conducted in Karachi, Pakistan. A sample of 193 dyads of mother–children (6–30 months of age) was selected via purposive sampling. Saliva samples of the dyads were collected to assess S. mutans count. Caries assessment was performed for both using the DMFT index. A pretested questionnaire was used. The association of bottle‐feeding, oral hygiene measures, and other factors with S. mutans counts in children were also explored. Zero‐inflated negative binomial regression model at a 5% level of significance was applied using STATA version 12.0. Results Out of 193 children, 109 (56.47%) were males and 84 (43.52%) were females. The mean age of mothers and children was 29.4 ± 6.2 years and 19.54 ± 6.8 months, respectively. Maternal S. mutans counts were not statistically associated with child's S. mutans counts (Mean child's S. mutans count ratio: 1; 95% confidence interval [CI]: 1, 1.01; p = .882). Compared with children who were breastfed, S. mutans counts were higher in children who were bottle‐fed (mean S. mutans count ratio= 4.85 [95% CI: 1.53, 15.41], p = .007). Age of mother and present caries status of mothers was significantly associated with the child's S. mutans count. Conclusion No association between maternal S. mutans and child S. mutans was observed. However, maternal age, children who were breastfed, children who did not use pacifiers, and children with mothers who did not have caries, exhibited low S. mutans counts in their saliva.