Intakes of key nutrients from typical enriched post-discharge feedings for preterm infants, assuming milk intake of 160 mL/kg per day

Feeding strategy	Breastfeeding (or bottle feeding with expressed breast milk)			Formula
Strategy for enrichment	Breast milk × 6 feeds - and - premature discharge formula^[1,2] (22 kcal/oz) × 2 feeds	Breast milk × 5 feeds - and - premature discharge formula^[1,2] (22 kcal/oz) × 3 feeds	Breast milk × 6 feeds - and - premature formula^[3] (30 kcal/oz) × 2 feeds	Premature discharge formula (22 kcal/oz)
Energy (kcal/kg/day)	112	113	120	117
Protein (g/kg/day)	1.9	2.2	2.3	3.4
Calcium (mg/kg/day)	59 to 64	70 to 76	94 to 100	125 to 144
Phosphorus (mg/kg/day)	34 to 35	41 to 42	49 to 56	74 to 80

This table uses the following assumptions:

Feeding intake is 160 mL/kg/day.
Breast milk provides 20 kcal/oz with 0.9 g/dL of protein.^[4]

For infants who are less than 44 weeks gestational age, a liquid formulation of premature discharge formula^[1,2] or premature formula^[3] should be used rather than a powdered formulation. Nutrient composition of these formulas are based upon commonly used commercial brands, as cited.

References:

Similac Neosure (premature discharge formula). Nutrition information available at: https://abbottnutrition.com/similac-neosure (Accessed on August 16, 2018).
Enfamil Enfacare (premature discharge formula). Nutrition information available at: https://www.meadjohnson.com/pediatrics/us-en/product-information/products/premature/enfamil-enfacare (Accessed on August 16, 2018).
Similac Special Care 30. Nutrition information available at: https://abbottnutrition.com/similac-special-care-30 (Accessed on August 16, 2018).
Pediatric Nutrition Handbook, 7th ed, Kleinman RE, Greer FR (Eds), American Academy of Pediatrics, Elk Grove Village, Illinois 2014.

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Intakes of key nutrients from typical enriched post-discharge feedings for preterm infants, assuming milk intake of 160 mL/kg per day