The study investigated the association between physical andcogni ti ve development during early and middle childhood .Multistage sampling technique was followed in the selectionof participants . As part of mul ti stage sampling, using simple random sampling, 60 children between the ages of 4 to 6 years and 60 children between the ages of 7 to 9 years were selected from the two preschools and two primaryrnschools respectively . Children's height, head circumference, and mid-upper-arm circumference were measured in cm and weight in kilogram. Then cognitivernquestionnaire was administered for each child. The resul t showed that there is positive and statistically significant relationship between physical and cognitive development .rnThe resul t also s howed tha t the predicti ve validi ty of physical development on cogni tive development is significant for the preoperational group but not forrnconcrete opera tional group. When across chronological agernis considered , the predicti ve validi ty of physicalrndevelopment on cognitive development was found to bernstatistically significant for children of 4 and 5 years butrnnot for children of 6 to 9 years. The finding al so showedrnthe existence of statistically significant difference inrnthe predicti ve validi ty of physical development onrncognitive development across sexes particularly betweenrnmale medium and female medium, and male high and femalernhigh groups, but not between male low and female lowrngroups