Some kids are just small for their age. My 7 yr old non-cah daughter who will be 8 in November is only 41pounds. She weighed exactly 18 pounds at 18 mos. Now my cah son who will be 7 in Feb weighs 5 pounds more than her. You just never know. I'm glad to hear that you both have experience positive results with the change from the liquid. Best of luck for the future. Judy