A 1 month 13 day old infant presented with poor weight gain since birth. The infant was born at term via SVD with a birth weight of 3.13kg. Initial weight loss and poor subsequent weight gain was noted. Investigations revealed metabolic acidosis and the infant required intubation. The case discusses evaluating growth patterns in infants, identifying causes of failure to thrive, and obtaining a thorough feeding history to determine the underlying cause of poor nutrition.