Researchers from six Singapore primary schools scanned the feet of nearly 3,300 children and measured their body weight to explore whether heavier children tend to have different foot shapes. Using special scanning technology, they looked for three conditions: flatfoot (collapsed arches), hallux valgus (bunions or inward-turning big toes), and hindfoot valgus (outward-turning heels).
The study found clear links between weight and foot structure, offering insight into how a child's developing body responds to extra load.
Weight puts real pressure on developing arches
The strongest finding: children with higher BMI were significantly more likely to have flatfoot. For every increase of roughly 4.7 kg/m² in BMI, the odds of developing moderate-to-severe flatfoot jumped by 37%. This makes sense physically—extra weight places greater pressure on the arches of children's still-developing feet, gradually flattening them over time.
The research also revealed how common these conditions are locally: 64% of screened children had flatfoot, and over 53% showed hindfoot valgus. This suggests these foot shapes are normal in Singapore's school-age population.
Interestingly, weight affected heel position the opposite way
Children with higher BMI were actually less likely to have outward-turning heels (hindfoot valgus). Researchers aren't certain why, but suspect weight distribution may alter foot alignment differently depending on which part of the foot we're examining.
It's important to remember this study shows association, not direct cause-and-effect. Other factors like genetics and natural development patterns also strongly influence foot shape.
Most children's flat feet don't cause problems—but active habits still matter
The reassuring news: flatfoot and hindfoot valgus are common childhood conditions that often resolve naturally as children grow. Many children don't experience pain or difficulty. However, this research gives parents a concrete reason to support regular physical activity during these crucial growing years. Movement and play strengthen developing feet and support healthy body weight simultaneously.
If your child complains of foot or leg pain, tires unusually quickly during play, or you notice limping, a check-up with your pediatrician is worthwhile—even though these foot conditions are normal.