To investigate the effects of frequency and duration of breast-feeding on infants' milk intake and weight gain, two groups of mother-infant pairs were studied during the first month after delivery. Mothers in the control group (n = 24) nursed their infants on a 3- to 4-hour schedule. Those in the experimental group (n = 20) were encouraged to nurse frequently. During the first 14 postpartum days, all mothers recorded the length and time of each breast-feeding. On the 15th and on the 35th postpartum day, milk intake per feeding for 24 hours and infant weight gain from birth were measured. During the first 2 weeks after delivery, mothers in the experimental group nursed more frequently (9.9 v 7.3 feedings per 24 hours; P .0001). On day 15, their infants took more milk (725 v 502 mL/24 h; P .0002), and had gained more weight from birth (561 v 347 g; P .02). On day 35, although mothers in the experimental group were still nursing more frequently (9.8 v 6.8 feedings per 24 hours; P .01), milk intake and weight gain from birth were not significantly different.
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机译：为了研究母乳喂养的频率和持续时间对婴儿的牛奶摄入量和体重增加的影响，在分娩后的第一个月内对两组母婴进行了研究。对照组中的母亲（n = 24）按3至4小时的时间表对婴儿进行护理。鼓励实验组（n = 20）的那些人经常护理。在产后的前14天中，所有母亲均记录了每次母乳喂养的时间和时间。在产后第15天和第35天，测量每次喂养24小时的牛奶摄入量和婴儿出生时体重的增加。在分娩后的前两周内，实验组的母亲更频繁地哺乳（每24小时9.9 v 7.3喂养; P <.0001）。在第15天，他们的婴儿喝了更多的牛奶（725 v 502 mL / 24 h; P <.0002），并且出生后体重增加了（561 v 347 g; P <.02）。在第35天，尽管实验组的母亲仍然更加频繁地哺乳（每24小时9.8 v 6.8喂养; P <.01），但牛奶的摄入量和出生时体重的增加没有显着差异。
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