Karl was a baby boy, born at full term with a birth weight of 3.2 kg via caesarean section for fetal distress. The delivery was uneventful, and he started breastfeeding as usual. His antenatal ultrasound showed hydronephrosis in the third trimester. A paediatrician was consulted to assess the baby after delivery. This case demonstrates how a seemingly ordinary complaint can result in an unusual and unexpected outcome.