In a case of hyperophic pyloric stenosis, which of the following metabolic disturbance is found?

Due to vomiting of the gastric contents, infants develop a hypochloremic, hypokalemic metabolic alkalosis. The urine pH is high initially but eventually drops because hydrogen ions are preferentially exchanged for sodium ions in the distal tubule of the kidney as the hypochloremia becomes severe. Ref: Schwaz's Principles of Surgery, 9th Edition, Chapter 39