Newborns sleep 14–17 hours in short cycles with no day/night rhythm yet. By 2–3 months a pattern emerges: 3–4 naps, longer night stretches, and a total of 14–15 hours. By 6 months, 2–3 naps and ~14 hours; by 9–12 months, 2 naps and 12–14 hours. The wake window — how long baby can comfortably stay awake between sleeps — grows from ~45–60 minutes as a newborn to 3–4 hours near the first birthday. The tool works backwards from your desired wake time, subtracting naps and windows to propose a bedtime that keeps the day in balance.
新生儿每天睡 14–17 小时，周期短、尚无昼夜节律。2–3 个月时规律出现：3–4 次小睡、夜间更长，总量约 14–15 小时。6 个月时 2–3 次小睡、约 14 小时；9–12 个月时 2 次小睡、12–14 小时。清醒窗口——宝宝两次睡眠间能舒适保持清醒的时间——从新生儿期的约 45–60 分钟，增长到一周岁附近的 3–4 小时。本工具从你期望的起床时间倒推，扣除小睡与清醒窗口，提出一个让全天保持平衡的就寝时间。
