追加：第 20 节第 15 条，给婴儿添置东西时别买带轮子的学步车，想让他坐着玩就换成没轮子的游戏站台或游戏围栏

2026-10-14 追加在节末。全书原来没有一处提到学步车（grep -rn 学步车 book/ docs/ 无结果），不算重复。本节加完是 15 条，不到 20 条，按规则不补节首导览。

和本节第 11 条（大件按「借、买二手、买新」的顺序考虑）的分工：第 11 条讲大件怎么省钱和二手的安全边界，这条讲学步车这一样东西压根别买，备注里指回第 11 条。

收益量级与证据等级

  • 证据等级定 B：伤害数字来自美国全国急诊伤害监测（NEISS）的大样本，但只是记录受伤人数，没有「用学步车的孩子和不用的孩子相比风险高多少」的对照数字。推迟走路那一半更弱，只有横断面调查和质量偏低的小综述。
  • 收益量级定「中」，凭判断：死亡率口径按阈值要看相对降幅，这里没有降幅数字。学步车相关的伤害只要不用学步车就全部避开，住院孩子里近四成是颅骨骨折，后果重；但死亡数低（美国 25 年报告 34 起），基础发生率不高，所以不定「大」。
  • 没标争议：伤害那一半各方一致，美国儿科学会、加拿大政府立场相同。推迟走路那一半证据不硬，已在收益栏如实写出。

1. Sims 2018 Pediatrics

  • 题录：Sims A, Chounthirath T, Yang J, Hodges NL, Smith GA (2018). Infant Walker-Related Injuries in the United States. Pediatrics, 142(4), e20174332。PMID 30224365，https://doi.org/10.1542/peds.2017-4332。作者、卷期经 Europe PMC REST（resultType=core）核对，摘要从同一接口取得。
  • 约 23 万：「An estimated 230 676 children <15 months old were treated for infant walker-related injuries in US emergency departments from 1990 to 2014.」
  • 头颈与楼梯：「Most of the children sustained head or neck injuries (90.6%) and 74.1% were injured by falling down the stairs in an infant walker.」
  • 住院与颅骨骨折：「Among patients who were admitted to the hospital (4.5%), 37.8% had a skull fracture.」
  • 强制标准之后：「The average annual number of injuries decreased by 22.7% (P = .019) during the 4-year period after the implementation of the federal mandatory safety standard compared with the 4-year period before the standard.」标准实施年份见结论「the federal mandatory safety standard in 2010」。
  • 仍可避免：「Despite the decline in injuries, infant walkers remain an important and preventable source of injury among young children, which supports the American Academy of Pediatrics' call for a ban on their manufacture and sale in the United States.」条目写成「仍是孩子受伤的一个重要来源，而且是可以避免的」，没写「完全」。

2. 美国儿科学会 2001 年立场声明

  • 题录：American Academy of Pediatrics, Committee on Injury and Poison Prevention (2001). Injuries associated with infant walkers. Pediatrics, 108(3), 790-792。PMID 11533353，https://doi.org/10.1542/peds.108.3.790。摘要经 Europe PMC 取得。
  • 死亡数：「Thirty-four infant walker-related deaths were reported from 1973 through 1998.」
  • 防不住：「The use of warning labels, public education, adult supervision during walker use, and stair gates have all been demonstrated to be insufficient strategies to prevent injuries associated with infant walkers.」
  • 1997 年标准：「walkers manufactured after June 30, 1997, must be wider than a 36-in doorway or must have a braking mechanism designed to stop the walker if 1 or more wheels drop off the riding surface, such as at the top of a stairway.」
  • 主张禁售：「because there is no clear benefit from their use, the American Academy of Pediatrics recommends a ban on the manufacture and sale of mobile infant walkers.」
  • 替代：「Stationary activity centers should be promoted as a safer alternative to mobile infant walkers.」
  • 学走路：「Walkers do not help a child learn to walk; indeed, they can delay normal motor and mental development.」
  • 摘要里还有「In 1999, an estimated 8800 children younger than 15 months were treated in hospital emergency departments」，条目改用 Sims 2018 的 25 年总数，没写这一年的数。

3. 美国儿科学会家长页 HealthyChildren.org

  • https://www.healthychildren.org/English/safety-prevention/at-home/Pages/baby-walkers-a-dangerous-choice.aspx，页面写「Last Updated 8/15/2022」。curl 带代理取得。
  • 大人在旁边：「Most walker injuries happen while adults are watching. Parents or caregivers simply cannot respond quickly enough. A child in a walker can move more than 3 feet in 1 second!」3 英尺约 0.91 米，条目写成「3 英尺（约 0.9 米）以上」，说人话写「0.9 米以上」。
  • 不能学走路：「Many parents think walkers will help their children learn to walk. But they don't. In fact, walkers can actually delay when a child starts to walk.」
  • 烫伤溺水：「It is now easier for a child to pull a tablecloth off a table and spill hot coffee, grab pot handles off the stove」；「Drown —child can fall into a pool or bathtub while in a walker.」
  • 替代品三样：「Stationary activity centers —they look like walkers but have no wheels. They usually have seats that rotate, tip, and bounce. Play yards or playpens ... High chairs」。
  • 别人家和托育机构：「be sure that there are no walkers wherever your child is being cared for, such as child care centers or in someone else's home.」

4. Garrett 2002 BMJ

  • 题录：Garrett M, McElroy AM, Staines A (2002). Locomotor milestones and babywalkers: cross sectional study. BMJ, 324(7352), 1494。PMID 12077035，PMC116446，https://doi.org/10.1136/bmj.324.7352.1494。Europe PMC 没有摘要，全文从 https://pmc.ncbi.nlm.nih.gov/articles/PMC116446/ 取得。
  • 设计和人数：「We performed a cross sectional survey of normal healthy infants born at term attending day care centres」；「We excluded 17 premature infants leaving 190 valid responses」。爱尔兰都柏林大学的研究，样本来自北爱尔兰 Foyle 地区托育中心。
  • 独立走路：表中「Walk alone 58.14 61.12 −2.98 (−4.51 to −1.45) 0.0002」，单位是周，不用学步车的 58.14 周，用的 61.12 周。条目写「平均晚约 3 周」。
  • 剂量关系：「each aggregated 24 hours of babywalker use was associated with a delay of 3.3 (95% confidence interval 2.5 to 4.1) days in walking alone」。条目只写「用得越多晚得越多」。
  • 同刊有一封来信（Gardner FE 2002, BMJ 325:657，题为「Potential confounding factors were not measured」）质疑没测混杂因素，条目用「只是一次性问卷调查，没有分组对照」交代这层弱点。

5. Burrows & Griffiths 2002 小综述

  • 题录：Burrows P, Griffiths P (2002). Do baby walkers delay onset of walking in young children? Br J Community Nurs, 7(11), 581-586。PMID 12447120，https://doi.org/10.12968/bjcn.2002.7.11.10889。摘要经 Europe PMC 取得。
  • 「Two RCTs and two cohort studies were identified」；「The results of the two RCTs did not demonstrate a significant effect on the onset of walking.」
  • 「a pooled analysis of the four studies suggested a delay of between 11 and 26 days. Although the quality of the studies was relatively poor these studies lend no support to the argument that walkers aid the development of walking.」
  • 另查到 Badihian 2017 系统综述（Iran J Child Neurol 11(4):1-6，PMID 29201117），结论是「Evidence against baby walker is not enough regarding its negative effect on child development」，和条目「这一半的证据不硬」一致，没进来源栏。Siegel & Burton 1999（J Dev Behav Pediatr 20(5):355-361，109 名婴儿，用学步车的坐、爬、走都更晚）同样只是跟踪比较，结论方向和 Garrett 相同，没另引。

6. 加拿大禁售

  • 新闻稿：Health Canada News Release 2004-15，https://www.canada.ca/en/news/archive/2004/04/minister-pettigrew-announces-ban-baby-walkers.html。curl 超时，无头 Chrome 带代理取得。
    • 「April 7, 2004 ... Health Minister Pierre Pettigrew today announced the Government of Canada's immediate prohibition of the sale, advertisement and importation of baby walkers in Canada.」
    • 「This prohibition also applies to the sale of baby walkers as second-hand items and so they may not be sold at flea markets or garage sales. Persons who already have baby walkers are advised to permanently dismantle and dispose of them.」
    • 新闻稿里部长说「Canada is the first country in the world to ban the sale of these products」，条目没写「全世界第一个」，只写加拿大禁卖。
  • 现行法：Canada Consumer Product Safety Act (S.C. 2010, c. 21)，https://laws-lois.justice.gc.ca/eng/acts/C-1.68/FullText.html，curl 带代理取得。
    • 第 5 条：「No person shall manufacture, import, advertise or sell a consumer product listed in Schedule 2.」
    • 附表 2 第 3 项：「Baby walkers that are mounted on wheels or on any other device permitting movement of the walker and that have an enclosed area supporting the baby in a sitting or standing position so that their feet touch the floor, thereby enabling the horizontal movement of the walker.」

7. 国内

  • 全国标准信息公共服务平台 GB 14749-2006 页面：https://std.samr.gov.cn/gb/search/gbDetailed?id=71F772D7639DD3A7E05397BE0A0AB82A。页面写「当前标准 GB 14749-2006 现行 婴儿学步车安全要求 即将被以下标准替代 GB/T 14749-2025 （全部代替） 儿童呵护用品安全 婴儿学步车」，发布 2006-03-08，实施 2007-01-01。
  • 新标准 GB/T 14749-2025 的实施日期：搜索结果摘要说 2026-11-01，但标准平台上那一页取到的是计划信息，没核到实施日期，条目没写日期，也没写新标准从强制改成推荐这层（编号变成 GB/T，但没取到官方说明）。标准正文没取到，条目没写标准里的具体要求。
  • 没查到市场监管总局针对学步车的消费提示原文。搜索结果里提到北京市市场监管局有选购提示（适用 9 到 15 个月），没取到原文，没写。条目写「国内没查到禁售的规定」。

没写的

  • 任务原拟的「让他扶着家具站」：美国儿科学会家长页列的替代品是游戏站台、游戏围栏、高脚餐椅，没提扶家具，没找到别的出处，所以标题和正文都没写扶家具。