Pregestimil 24 Cal Ready-to-Use Formula, 48 calories per 2 fluid ounce nursette bottle. Pregestimil is an infant formula designed for infants who experience fat malabsorption and who may also be sensitive to intact proteins. Fat malabsorption or steatorrhea may be associated with cystic fibrosis, short bowel syndrome, intractable diarrhea and severe protein calorie malnutrition.