Psychomotor development was assessed in 1476 infants from four differe
nt levels of urbanization in and around Lahore, Pakistan. Development
was assessed monthly at birth to 24 months of age by using a set of 10
milestones selected from the Denver Developmental Screening Test and
the Developmental Screening Inventory. The psychomotor development of
children in the upper middle (Um) class was consistent with reference
population groups in Europe and North America, hence this group was us
ed as control. There was significant delay in the psychomotor developm
ent of infants belonging to the poorer areas compared to the Um class.
There was no sex difference in the development of the milestones in a
ny study area, except for girls in the Um class who were earlier for a
bout one month than boys in talking. Infants in the poorer areas were,
on average about 3 months, delayed in their walking and fine motor ac
tivity (building a tower of 3 cubes) in comparison with the Um class.
Observed disturbance in psychomotor development at an early age may af
fect the abilities and achievements in later life.