Pediatrics C.V.S 266c645d The development of septal defects in the fetal hea occurs at A 3-5 weeks B 6-8 weeks C 9-12 weeks D 13-15 weeks High-Yield Explanation Fetal hea septal defect develop by 6-8 weeks. Ref : Ghai essential of pediatrics, eighth edition, p.no: 402