Necrotizing fasciitis is a rare and life-threatening soft-tissue infection characterized by rapidly spreading inflammation and subsequent necrosis of the fascial planes and surrounding tissue. These children should be managed promptly with broad-spectrum antibiotics and possible surgical debridement. Here, we present a 5-week-old female infant who presented with fever and ulcer on right lower jaw. She had a sudden onset of darkening of the right lower jaw, which progressed to reddish discoloration, and then an ulcer developed in the middle of this area of discoloration. She had a tender swelling extending from the right pre-auricular area to the right upper neck, crossing the right jaw and extending toward the right cheek and maxillary area. Swelling had areas of hyperpigmentation with an ulcer measuring 2 by 3 cm at the center of the lesion, oozing purulent fluid, and Staphylococcus aureus was cultured. The surgeons conducted incision and debridement in theater after suspecting necrotizing fasciitis of the jaw and the baby was kept on intravenous antibiotics, antiretroviral therapy and was dressed daily. The child fared well thereafter.