Estimates of breast milk composition per 100 mL at various postnatal ages (mean ± 2 standard deviations)

	Energy (kcal)	Protein (g)	Fat (g)	Calcium (mg)	Phosphorus (mg)
Preterm
1st week	60 (45-75)	2.2 (0.3-4.1)	2.6 (0.5-4.7)	26 (9-43)	11 (1-22)
2nd week	71 (49-94)	1.5 (0.8-2.3)	3.5 (1.2-5.7)	25 (11-39)	15 (8-21)
Week 3/4	77 (61-92)	1.4 (0.6-2.2)	3.5 (1.6-5.5)	25 (13-36)	14 (8-20)
Week 10/12	66 (39-94)	1.0 (0.6-1.4)	3.7 (0.8-6.5)	29 (19-38)	12 (8-15)
Term
1st week	60 (44-77)	1.8 (0.4-3.2)	2.2 (0.7-3.7)	26 (16-36)	12 (6-18)
2nd week	67 (47-86)	1.3 (0.8-1.8)	3.0 (1.2-4.8)	28 (14-42)	17 (8-27)
Week 3/4	66 (48-85)	1.2 (0.8-1.6)	3.3 (1.6-5.1)	27 (18-36)	16 (10-22)
Week 10/12	68 (50-86)	0.9 (0.6-1.2)	3.4 (1.6-5.2)	26 (14-38)	16 (9-22)

Estimates as +/– 2 standard deviations assumed no skew. Energy values were bomb calorimeter measured values except for 10 to 12 weeks, which were calculated values. Protein values are true measured protein, not based on total nitrogen content.

Reproduced from: Gidrewicz DA, Fenton TR. A systematic review and meta-analysis of the nutrient content of preterm and term breast milk. BMC Pediatrics 2014; 14:216. Copyright © 2014 BioMed Central Ltd.

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Estimates of breast milk composition per 100 mL at various postnatal ages (mean ± 2 standard deviations)