Do pediatricians use the same reference chart for this? My girls have always been little, but their percentages have always been normal. I have always wondered a bit, but it didn't really dawn on me until now. At 15mo Jovie was just over 20lb...like 20.3...anyway, they said that was about 40%. I couldn't have even switched her to forward facing before then if I wanted to. Now at almost 18mo I think she is artound 21-22lb and I will bet anything she is still in the same percentage. They show me the chart and it is always for the right age and for girls. She is tall too, but I never believe how high they put that either. Just wondering if they all used the same thing because I have a feeling that at some pedi offices Jovie would be getting close to the bottom of the charts.