A new study tracking over 1,000 children from age 1 to age 8 reveals that distinct body mass index growth patterns during early childhood are associated with cardiovascular and metabolic risk at school age. The research found that children following a persistent obesity trajectory or a late-onset obesity pattern had significantly higher cardiometabolic risk scores at age 8 compared to peers with normal growth. The findings suggest that both the total amount of excess weight accumulated over time and the timing of accelerated weight gain during specific developmental windows are important for identifying children at heightened risk.
Childhood obesity predicts later cardiometabolic disease, but single-time weight measures may miss dynamic growth information. In early childhood, the timing of rapid weight gain and duration of excess weight may be as important as body mass index (BMI) at any one age. Evidence from Chinese children remains limited. We therefore examined whether repeated BMI measurements from ages 1 to 7 revealed trajectories associated with cardiometabolic risk at age 8, and further assessed cumulative and timing-specific effects.
The findings were published (DOI: 10.1007/s12519-026-01079-6) on June 21, 2026, in the World Journal of Pediatrics . Researchers from China and the United States conducted the prospective cohort study following 1072 mother-child pairs over eight years.
The research team measured children's height and weight annually during early childhood and assessed blood pressure, fasting glucose, and lipid levels at school age. They identified several distinct BMI growth patterns. Adverse patterns—late obesity growth and persistent obesity growth—were compared with a control group showing lean or normal growth. Both adverse trajectories were associated with higher continuous cardiometabolic risk scores, with the persistent obesity group showing the strongest effect. Children with persistent obesity patterns were more likely to develop cardiometabolic risk factors by school age, with a particularly strong association with hypertension.
The researchers also examined cumulative BMI exposure and BMI change across early childhood. They assessed how much and how long BMI exceeded a reference threshold, the age at adiposity rebound, and BMI gain during specific developmental intervals. Greater cumulative excess burden, earlier adiposity rebound, and faster BMI gain during certain early childhood periods were independently linked to higher cardiometabolic risk. Notably, BMI gain during the preschool period showed the most consistent associations across outcomes, suggesting that preschool years may be an important window for early risk monitoring.
"We found that how children grow in early life—not just their weight at a single time point—tells us something meaningful about their cardiometabolic health," the authors said. "The preschool years appear to be a critical window where accelerated BMI gain carries a stronger signal for later risk. This suggests we shouldn't wait until school age to start monitoring; repeated growth measurements in early childhood could help identify children who might benefit from earlier intervention."
The findings may have implications for pediatric care and public health monitoring. Rather than relying on a single BMI measurement at one age, the study supports tracking growth trajectories across repeated early childhood visits. Children who consistently show elevated BMI growth or early adiposity rebound may warrant closer monitoring and preventive support. The identification of a potentially sensitive window in early childhood suggests that interventions promoting healthy weight gain could be most impactful during this period. For clinicians, these findings reinforce the value of routine growth monitoring and suggest that growth patterns over time offer more predictive information than single-point assessments.
