True for a 2yrs old boy is
Weight four times that of bih weight
Rides bicycle
Climbs up and down the stairs with alternating steps
Ossification center for radius head appears
At 2yrs weight becomes 4 times that of bih ( at bih 3kgs, at 2yrs 12kgs) A child is able to ride a bicycle by the age of 3yrs A child is able to climb up and down the stairs at 4yrs Ossification center for radius head appears at 3-4 yrs of age. Ref: Ghai ,9th edition, chapter 2 & 3.
General anatomy