ABSTRACT We report a case of a 14-month-old boy with atopic dermatitis (AD) who presented to our hospital with hypocalcemic tetany and gross motor delay. Further laboratory and imaging confirmed the diagnosis of vitamin D deficiency and rickets. He was breastfeeding and on a restricted diet due to presumed multiple food allergies. He received calcium and vitamin D supplementation which corrected his hypocalcemia. The patient developed Staphylococcus aureus bacteremia and superficial septic thrombophlebitis for which he was treated with antibiotics and anticoagulation. An elimination diet should be avoided in AD patients as true food-induced AD is rare and management should focus on optimal skincare. AD patients have a higher rate of S. aureus skin colonization, which increases their risk for infectious complications. This case also highlights the importance of maintaining a high index of suspicion for rickets in children with isolated gross motor delay, especially in those with risk factors.