Children between ages 3 and 6 become better at visually estimating quantities like number and area. This study examined whether they also improve at judging fire intensity, a dynamic and ecologically relevant visual cue. Over 70 children compared simulated fires in train engines, with varying intensity ratios. Results indicated that older children were more accurate, especially when differences were larger. These findings suggest that children's ability to estimate visual magnitudes, including fire intensity, becomes more precise with age.