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Abstract Background Despite progress, the prevalence of childhood undernutrition in India remains amongst the highest globally. Objective We aimed to evaluate the impact of a functional integration interventional package during the antenatal period on childhood growth parameters. Methods This is a post-interventional follow-up study of a maternal nutrition interventional study conducted between 2018 and 2019 among women in their first trimester of pregnancy from three districts in West Bengal, India. Pregnant women received a package of augmented interventions from study staff which supplemented those provided to them under the state-run programmes, that included body-mass-index measurement at pregnancy registration, monthly weight monitoring, targeted dietary counselling, supervised supplementary nutrition intake and iron-folic acid supplementation during daily anganwadi center visits. In the current follow-up study conducted in 2021, age-matched pregnant women from the same areas who were pregnant during the same period as in the original study and had received standard-of-care under the state-run programmes were recruited into a comparison group. Study staff collected data regarding maternal height and serial weights that were recorded at antenatal visits in 2018-19, and birth and infant characteristics. Child height and weight were measured during the follow-up visit in 2021, which were used to calculate the relative risks of stunting, wasting and underweight using generalized linear models, to understand the sustained impact of the intervention beyond infancy. Eight-hundred-nine mother-child dyads (406 intervention; 403 comparison) were followed. Results Median age of women in the intervention and comparison group was 23 (IQR 20–25) and 25 (IQR 24–27) years respectively. Median gestational-weight-gain was higher amongst intervention group women (9 vs. 8 kg, p = 0.04). Low-birth-weight prevalence was 29.3% (119/406) and 32.0% (129/403) in the intervention and comparison group. At 12–35 months of age, children born to women in the intervention group had significantly reduced risk of stunting (RR = 0.65, 95% CI 0.44–0.94), wasting (RR = 0.57, 95% CI 0.33–0.97) and underweight (RR = 0.61, 95% CI 0.42–0.88). Conclusions These results indicate that functional integration and strengthening of routine antenatal care services including targeted nutritional counselling to expectant mothers can have distal beneficial effects on childhood undernutrition beyond the immediate post-natal period.