TABLE 3. Mean ± SE for milk composition, gross energy, and milk yield value at one and 3.5 months of infant age (N = 58).

	1 month		3.5 months
	Mean ± SE	Range	Mean ± SE	Range	t	P
Milk composition
Fat (%)	4.6 ± 0.2	2.2–11.7	6.2 ± 0.2	3.2–14.2	8.32	<0.0001
Protein (%)	1.8 ± 0.03	1.4–2.5	2.1 ± 0.04	1.6–3.0	7.58	<0.0001
Sugars (%)	7.6 ± 0.04	6.6–8.2	7.5 ± 0.04	6.3–8.1	−3.08	0.003
GE (kcal/g)	0.83 ± 0.02	0.6–1.5	0.99 ± 0.02	0.7–1.7	8.72	<0.0001
Milk yield value (g)	11.4 ± 0.6	3.8–22.6	17.0 ± 1.0	4.9–33.8	8.24	<0.0001

Milk composition, energy density, and yield changed significantly between the two time points.