Background: Children Intelligence depends on various factors such as- heredity, Family educational background, occupation of the parents, family income, environment etc. Birth is a natural process but it also has to processes viz. Caesarean and Non-caesarean. But how can delivery mode of the children affect their Intelligence! Aim: To find out the difference in Intelligent level between caesarean and non-caesarean school boys. Materials & Methods: Total 240 subjects (120 Caesarean and 120 Non- Caesarean) of class IX- X-level school boys were selected from five different schools located at Birbhum and Kolkata, West Bengal, India. ‘G.C. Ahuja Intelligence questionnaire’ were used to measure Intelligence. This questionnaire composed of total 135 questions and eight different types of test (classification, analogies, reasoning, vocabulary, comprehension, series and best answer). The data for Intelligence were calculated by using descriptive statistics and “t” test and level of significance was set on 0.05 level. Results: There is a significant difference exists on Intelligence level between caesarean and non-caesarean boys. The calculated “t” value (2.372) are higher than tabulated “t” 0.05(238) value (1.97). The Mean and Standard deviation of Caesarean and Non-caesarean boys Intelligence level has been found 96.96± 17.00 and 90.40 ± 25.06. Conclusion: Caesarean boys posses higher Intelligence level than Non-Caesarean boys.