My granddaughter is 2.5 years old 34 lbs 39.5 inches tall. her waist is 19 and chest 20. I cut out a size size 3 with size 3 length based on her weight because the size 4 looked so much longer on the pattern. I basted on the cuff and the pajamas inseam is 14 with the cuff folded up. I am concerned they will be too short, her inseam for pants is 16.5 inches. Any ideas how to fix this pair (I have them cut out and the side seams sewn together)? For the next pair should I cut out the pattern for the size 4 length or add length in the middle of the leg like a pair of pants?