Never; he is usually quite willing to do so as soon as his muscles and bones are strong enough. None of the contrivances for teaching children to walk are to be advised. _When do children begin to talk?_ Generally at one year a child can say "papa" and "mamma" or other single words. At the end of the second year the average child is able to put words together in short sentences. _If at two years the child makes no attempt to speak, what should be suspected?_ Either that the child is a deaf-mute or that it is mentally deficient, although this is occasionally seen in children who are only very backward. _Table showing the Average Weight, Height, and Circumference of Head and Chest of Boys_[1] At birth Weight 7-1/2 pounds. Height 20-1/2 inches. Chest 13-1/2 " Head 14 " One year Weight 21 pounds. Height 29 inches. Chest 18 " Head 18 " Two years Weight 26-1/2 pounds. Height 32-1/2 inches. Chest 19 " Head 19 " Three years Weight 31 pounds. Height 35 inches. Chest 20 " Head 19-1/2 " Four years Weight 35 pounds. Height 38 inches. Chest 20-3/4 " Head 19-3/4 " Five years Weight 41 pounds. Height 41-1/2 inches. Chest 21-1/2 " Head 20-1/2 " Six years Weight 45 pounds. Height 44 inches. Chest 23 " Seven years Weight 49-1/2 pounds. Height 46 inches. Chest 23-1/2 " Eight years Weight 54-1/2 pounds. Height 48 inches. Chest 24-1/2 " Nine years Weight 60 pounds. Height 50 inches. Chest . 25 " Ten years Weight 66-1/2 pounds. Height 52 inches. Chest 26 " The above weights are with ordinary house clothes. [1] Weights for the first four years are without clothes. The weight of girls is on the average about one pound less than boys. They are about the same in height.