Anthropometric markers are the most important aspect of a child's health assessment. Using large-scale nationally representative data from the National Family Health Survey (NFHS-4), 2015-2016, this study aimed to investigate the relationship between children born to women with high-risk fertility behaviours and children's health outcomes. The sample consisted of 2,55,726 children of currently married women aged 15-49 years in India. The key explanatory variable, high-risk fertility behaviour was defined by women's age at birth (below 18 or above 34 years), birth interval (less than 24 months), and higher birth orders (four and above). The key outcome variables for assessing child health outcomes were stunting, wasting, and underweight in children aged 0-59 months. We used descriptive statistics, Pearson's chi-square test and logistic regression models to analyse the objectives. Approximately 33% of children were born with any single high-risk condition in the last 5 years in India. The bivariate analysis showed that all three components of child health, stunting, wasting, and underweight, were higher among children born to women with high-risk fertility behaviour. The findings from the multivariable analysis suggest that children born with a high risk fertility behaviour were suffering from stunting (AOR = 1.30; 95% CI 1.27-1.33) and underweight (AOR = 1.23; 95% CI 1.20-1.27). In addition, children born to women of multiple high-risk categories had higher odds of stunting (AOR = 1.53; 95% CI 1.46-1.59) and underweight (AOR = 1.38; 95% CI 1.32-1.44) as compared to children born to women with no risk. Our findings highlight an urgent need for effective legislation to prevent child marriage that would be helpful in increasing the maternal age at birth. The government should also focus on the interventions in health education and improvement of reproductive healthcare to promote optimal birth spacing.