<prompt> A child climbs with alternate steps, builds a tower 89 cubes, tells I but not his name and can not say his age and sex, the probable age is36 months24 months30 months48 months  <response>: A child climbs stairs with alternating feet, refers to self as I and builds a tower of 9 cubes by the age of 30 months.A child knows his gender and age by 3 years. 