Background: Both genetic background and environmental factors have an impact on children's intellectual development. One of the initial postpartum experiences is breastfeeding.  Aim and objectives: The main goal of this research was to compare the level of intelligence between breastfed children and non-breastfed and find if there is an impact of breastfed on IQ.  
Subjects & methods: This cross-sectional research was conducted in pediatric clinics at Al-Azhar University Hospitals. Research was showed on 50 children. Results: regarding Full-Scale Intelligence Quotient of Wechsler Intelligence Scale of studied children. Full-Scale Intelligence in breastfed group ranged from 75 to 99 with mean ± SD = 88.39 ± 6.42 while in non-breastfed  group the Full-Scale Intelligence  ranged from 64 to 92 with mean ± SD = 82.63 ± 7.15. Conclusion: The present study compare intelligence level between breastfed and non-breastfed children. We concluded that there was significant relation between high Wechsler Intelligence Scale score and breastfed.