A 12-month-old whose weight increased from the 25th percentile to the 50th percentile
A 6-month-old whose weight has remained at the 50th percentile since birth
A 2-year-old whose weight decreased from the 75th percentile to the 25th percentile over 6 months
A 4-year-old whose height and weight are both steadily at the 10th percentile and proportionate.