Lewis and Brooks argued that an important developmental milestone is reached when children become able to recognize themselves visually without the support of seeing contingent movement.
路易斯和布鲁克斯认为，当儿童不借助于观察偶然行为，也能通过视觉认出自己时，他们就达到了发育的一个重要里程碑。
It might be helpful to think of moving from a bottle to a cup as a developmental milestone, like moving from crawling to walking, which is something to celebrate, even if it has challenges.
Gooze说，“换种想法可能有帮助：用杯子换下奶瓶子是成长发育的一个里程碑，如同由爬学会走，那是值得庆贺的，尽管这有点儿挑战性。”
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