Table 3

Sleep period and sleep cycle times (min) in breast fed and formula fed infants

StudyBreast fedFormula fed
Active sleepQuiet sleepActive sleepQuiet sleep
*p<0.01 breast fed versus formula fed.
2–3 wk25 (2) (n = 30)18 (1) (n = 32)21 (3) (n = 6)17 (1) (n = 9)
45 (2) (n = 30)39 (4) (n = 5)
2–3 mth17 (2) (n = 16)18 (5) (n = 18)19 (3) (n = 15)20 (1) (n = 14)
36 (2) (n = 14)42 (3) (n = 12)
5–6 mth16 (2) (n = 13)22 (1) (n = 17)13 (1) (n = 13)22 (2)) (n = 16)
40 (2) (n = 12)32 (2) (n = 13)*