人一生中的某些阶段患营养低下的危险性也很高，如婴儿期、幼儿期、青少年期、妊娠哺乳期、以及老年期。
The risk of undernutrition is also greater at certain times in a person's life ie infancy early childhood adolescence pregnancy and lactation and old age.
按营养方式，将该期划分成异养、异养和自养并进及完全自养三个生长阶段。
This stage can be divided into three growth phases: heterotrophic, heterotrophic and autotrophic, autotrophic nutrition.
哺乳期是母猪特殊的生理周期，这一阶段的营养摄入直接影响母猪本身的生产能力，同时影响整个猪场的生产成绩和经济效益。
Lactating is a special phase of sow life circle, which nutrient intake directly influence not only sow's performance, also pig farm's productivity and economic efficiency.
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