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Breastfeeding increased sleep bout irregularity. Day-to-day changes in the number of sleep bouts (y-axis) by age (x-axis) illustrate the greater sleep bout irregularity (P = 0.001) of the breastfed infant (bottom panel, ApEn score of 0.95) by comparison with the formula-fed infant (top panel, ApEn score of 0.72).
