Comparison of Bladder Pressure Versus Regional Intestinal Tissue Oxygenation in Infants

This study is comparing two methods of monitoring abdominal pressure and blood flow in infants undergoing certain surgical procedures: traditional bladder pressure measurement versus a newer method that uses near-infrared light to measure oxygen levels in the intestinal tissue (called regional intestinal tissue oxygenation). The goal is to see which method better detects potential complications during surgery in very young patients. **You may be eligible if...** - Your infant is 12 months old or younger - They are scheduled for one of the following surgeries: laparoscopic kidney repair (pyeloplasty), a specific type of bowel surgery (minimal PSARP for anorectal malformation), or esophageal atresia repair through a small chest incision - You as the parent or legal guardian are willing and able to give consent **You may NOT be eligible if...** - The infant's abdominal wall is too thick for reliable monitoring on pre-operative imaging - Additional intestinal surgeries or non-standard procedures are planned - The infant has esophageal atresia and needs urgent emergency surgery - The infant's pre-operative urine sample shows abnormal results (for kidney surgery candidates) Talk to your doctor to see if this trial is right for you.