• Change in coefficient of fecal fat absorption from baseline to end of study period. Palatability. Percent carbon dioxide expired by 13C-mixed triglyceride breath test measuring exogenous lipase activity.
  

• Clinical Global Impression Severity Subscale
  
• Global Change Subscale. Weight gain/loss. Global Assessment effectiveness. Nitrogen excretion/24 hr. Mean dose of pancrease assessed/day and weight. Mean daily calories, fat intake. Coefficient fat absorption.
  

The objective of this randomized, Investigator-blinded, parallel group, multicenter, pilot study is to evaluate the preliminary safety, palatability and effectiveness of pancrelipase microtablets to improve fat absorption. The hypothesis is that PANCREASE MT will provide effective, safe and palatable pancreatic enzyme supplementation to be used for the treatment of fat malabsorption in a cohort of infants with cystic fibrosis-related pancreatic insufficiency. On Day 1 of the study, parents will be instructed to administer 500 units lipase/kg/meal for a full five days. Stool will be collected and analyzed during the last 72 hours of this baseline period. On Day 6 of the study, subjects will be randomly assigned to one of four treatment groups. Parents will be instructed to administer the appropriate dose for a full five days and stool will be collected and analyzed during the last 72 hours of this randomized treatment period.

Patients will receive PANCREASE MT 500 units lipase/kg/meal by mouth for a maximum of five doses per day for the first 120 hours. Patients will receive PANCREASE MT 500, 1000, 1500 or 2000 units lipase/kg/meal by mouth, for a maximum of five meals per day for the next 120 hours.