DU is using the figure 80 pounds, but doesn’t he look more like about 40 or 45 pounds?”
Yes, 40 or 45. He is not very old. Most kids do not get up to 80 pounds until maybe ten.
Trig is six years old. My five-year-old is in the 40-50 pound range, and Down’s children tend to be slower in growth than the average.