text_1: 从 婴儿 父母 获得 书面 知情 同意 后 , 其 纳入 标准 如下 : 在 妊娠 32 周前 出生 , 出生 体重 低于 1 , 500 g , 或者 同时 符合 这 两个 条件 , 并且 在 随机 分组 时 每日 喂奶 量 少于 30 mL / kg .
  
text_2: after written informed consent was obtained from parents , infants receiving less than 30 ml of milk per kilogram per day at randomization were eligible to participate if they were born before 32 weeks of gestation , had a birth weight of less than 1500 g , or both .
  