D.L.
HI Kelley, our 5 yr old son weighs 57 pounds and is just about 53" tall but he is also the tallest child in all of the Kindergarten classes at his school. Our grandson, who is also 5, only weighs 38 pounds and is about 40" tall, he had open heart surgery at 3 months old and seems to be growing at a much slower pace then our son. Our grandson's doctors have not diag. him with failure to thrive or put a label on him for his slow weight and height gain, as he is healthy in every other way.
Take care :)