HowToLiveWorse

CHAPTER 20 · 14 SOURCE ENTRIES

Newborn Survival Guide

刚出生的孩子怎么带

[← 回总目录](../README.md) 口径：婴儿死亡率与金钱。这一节只收关系到孩子能不能活下来、或者你要花多少钱的事，而且只收差别足够大、又有硬证据的。怎么哄、怎么带这些育儿细节，本书不写。出生之前和出院当天要办的事，见第 27 节。

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20-001
Evidence AlifespanSource-sensitive

Keep infants sleeping on their backs on a firm surface; share a room but not a bed; and do not place any soft items in the crib or bed.

让孩子仰着睡，睡硬的平面，同房不同床，床上不放任何软东西

Always place babies on their backs to sleep on a hard, flat surface. Parents and infants should share a room, but not the same bed. Never put pillows, blankets, bed rails, stuffed animals, or special shaped pillows in the sleeping area. Inclined cribs or baby chairs are only meant for sitting — they must never be used as a sleeping surface. In the United States alone, roughly 3,500 infants die each year from sleep-related causes.

Open the low-ROI detour

Move “Keep infants sleeping on their backs on a firm surface; share a room but not a bed; and do not place any soft items in the crib or bed.” to Future Me's calendar

One more exception feels free because the bill arrives outside the current scene.

Today I keep a few minutes, a bit of persistence and avoid interrupting my default routine.

Read the source and trade-off
20-002
Evidence AlifespanSource-sensitive

Administer the first dose of hepatitis B vaccine within 24 hours after birth

出生后 24 小时内打上乙肝疫苗第一针

The first dose of hepatitis B vaccine must be given to a newborn within 24 hours after birth. Roughly 95% of infants and toddlers who contract hepatitis B go on to develop chronic hepatitis. In contrast, the vast majority of adults who get infected recover on their own without medical intervention. Hence, the earlier this vaccine is administered, the greater its protective benefit. If the mother tests positive for hepatitis B surface antigen, the infant also needs to receive an injection of hepatitis B immunoglobulin at the same time.

Open the low-ROI detour

Move “Administer the first dose of hepatitis B vaccine within 24 hours after birth” to Future Me's calendar

I can spend longer deciding whether to start than the small action would take.

Today I keep a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-003
Evidence AlifespanSource-sensitive

Ensure your child receives all vaccines in the national immunization schedule at no cost; missed doses can be added later

按国家免疫规划把该打的疫苗打齐，全程免费，错过了只补没打完的剂次

All vaccines included in the national immunization schedule are completely free — clinics cannot charge a single cent. Both daycare centers and schools require proof of vaccination, so any missed doses will definitely be noticed and must be made up later. You only need to receive the remaining doses; there’s no need to restart the entire series from the beginning. Even if a different manufacturer produces the same vaccine, it can still be used. Conditions such as eczema, hives, allergic rhinitis, asthma, and even neonatal jaundice do not prevent vaccination, provided the condition remains stable.

Open the low-ROI detour

Move “Ensure your child receives all vaccines in the national immunization schedule at no cost; missed doses can be added later” to Future Me's calendar

The routine already works until the day the source says it may not.

Today I keep a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-004
Evidence Alifespan

Breastfeed exclusively for the first 6 months — no water needed; introduce solids at 6 months while continuing breastfeeding

前 6 个月只喂母乳，连水都不用喂，6 个月起加辅食并继续母乳

Breastfeeding should begin within the first hour after birth. For the first 6 months, infants only need breast milk — no water or other fluids are required. At 6 months, solid foods can be introduced, while breastfeeding should be continued until age 2 or beyond. These solid foods must include iron-rich animal-based products. If breast milk is insufficient or unavailable, formula is a perfectly acceptable alternative — there is no need to feel guilty. The choice between breast milk and formula has far less impact on a child’s survival than ensuring they sleep on their back.

Open the low-ROI detour

Move “Breastfeed exclusively for the first 6 months — no water needed; introduce solids at 6 months while continuing breastfeeding” to Future Me's calendar

There is no immediate alarm, so the sensible choice can wait for a less busy week.

Today I keep a few minutes, a bit of persistence and avoid interrupting my default routine.

Read the source and trade-off
20-005
Evidence Alifespan

Use water hotter than 70 °C to prepare formula, then let it cool before feeding; discard any leftovers.

冲奶粉用 70 ℃ 以上的水，冲好放凉再喂，喝剩的倒掉

Formula milk is not sterile and may contain a bacterium called Cronobacter sakazakii. Once newborns are infected, reported mortality rates range from 40% to 80%. To minimize this risk, first pour hot water into the feeding bottle, then wait until the temperature drops to around 73.8 °C before adding the formula. At this point, the milk remains above 70 °C, which can reduce the amount of this bacterium to less than one ten-thousandth of its original level. After preparation, let the milk cool completely before feeding, and discard any portions that are not consumed.

Open the low-ROI detour

Move “Use water hotter than 70 °C to prepare formula, then let it cool before feeding; discard any leftovers.” to Future Me's calendar

Future Me has a clearer calendar, more patience, and apparently the same responsibilities.

Today I keep a few minutes, a bit of persistence and avoid interrupting my default routine.

Read the source and trade-off
20-006
Evidence Alifespan

Do not feed honey to children under 1 year old

不满 1 岁不喂蜂蜜

Never give honey to babies under 1 year of age. This includes honey water, honey mixed into baby food, and any baked goods containing honey. Honey can contain bacteria that cause botulism. An adult’s gut microbiome is able to keep these bacteria in check, but a baby’s cannot. The same rule applies to homemade pickled foods and fermented products.

Open the low-ROI detour

Move “Do not feed honey to children under 1 year old” to Future Me's calendar

If I do not open the notes, no new task has technically appeared.

Today I keep a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-007
Evidence Blifespan

Vitamin K injection at birth is essential

出生时的维生素 K 针一定要打

Newborns naturally have very little vitamin K stored in their bodies. Without supplementation, it can lead to vitamin K deficiency bleeding; the delayed form often manifests as bleeding inside the brain. In regions where this injection isn’t routinely given, the incidence of such bleeding is about 478 cases per 100,000 newborns. Administering the injection is estimated to reduce this rate by over 78%. In China, all reputable hospitals routinely provide this injection during delivery. For home births or births at unregulated facilities, parents should proactively ask whether it was given.

Open the low-ROI detour

Move “Vitamin K injection at birth is essential” to Future Me's calendar

One more exception feels free because the bill arrives outside the current scene.

Today I keep a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-008
Evidence AlifespanSource-sensitive

Infants under 3 months with a body temperature of 38°C should be taken straight to the hospital — no home observation needed

不满 3 个月的婴儿体温到 38 ℃ 就直接去医院，不在家观察

Infants under 3 months of age with a body temperature of 38°C must be taken to the hospital right away. Do not wait at home, and do not give them fever reducers first to see if symptoms improve. Even if an infant at this age has a serious bacterial infection, fever may be the only symptom they show. Therefore, the fact that a baby seems alert and in good spirits is not a valid reason to keep them at home. For infants under 8 days old, there are no relevant medical guidelines at all, so they must be seen by a doctor immediately.

Open the low-ROI detour

Move “Infants under 3 months with a body temperature of 38°C should be taken straight to the hospital — no home observation needed” to Future Me's calendar

I can spend longer deciding whether to start than the small action would take.

Today I keep a little money, a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-009
Evidence BlifespanSource-sensitive

No matter how tired or angry you are, never shake a baby

无论多累多气都不要摇晃婴儿

A baby’s head makes up a large proportion of their body size, yet their neck muscles are still very weak. Shaking them forcefully can cause bleeding inside the brain and eyes, potentially leading to death or lifelong disabilities. Gentle rocking while trying to soothe them is not dangerous; the real risk comes from uncontrolled, violent shaking. When you feel yourself losing control, place the baby back in their crib and step away for a few minutes. Letting them cry for a short while is far safer than holding them and shaking them.

Open the low-ROI detour

Move “No matter how tired or angry you are, never shake a baby” to Future Me's calendar

The routine already works until the day the source says it may not.

Today I keep a few minutes, a bit of persistence and avoid interrupting my default routine.

Read the source and trade-off
20-010
Evidence Cmoney

When choosing diapers, focus on three things: fit, how often you change them, and whether they’ve been flagged in any quality inspections.

尿布不看牌子看三件事：合不合身、换得勤不勤、有没有被抽检通报过

No government agency has ever published an official ranking of “the best diaper brands.” The only information available comes from two sources: quality inspection reports issued by the State Administration for Market Regulation, and official investigations into specific incidents. A higher price tag does not guarantee safety, nor does being an imported product mean it meets safety standards. It’s wise to start by buying a small pack and using it for a week to check if your child develops rashes or skin irritation; only then should you consider buying in bulk.

Open the low-ROI detour

Move “When choosing diapers, focus on three things: fit, how often you change them, and whether they’ve been flagged in any quality inspections.” to Future Me's calendar

There is no immediate alarm, so the sensible choice can wait for a less busy week.

Today I keep a little money, a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-011
Evidence Cmoney

Consider buying big-ticket items in the order “borrow, buy used, buy new” — don’t buy them all at once

大件按「借、买二手、买新」的顺序考虑，别一次性配齐

Strollers, cribs, blankets, and toys are used for only a short time, and there’s plenty of them on the used market with few buyers. First, try to borrow them; if that’s not possible, buy used; only then should you consider buying new — this usually saves you thousands of yuan. However, it’s not advisable to buy used car seats or mattresses, since any structural damage from prior crashes isn’t visible to the naked eye. Things like postpartum care centers and early-education classes are optional big expenses; wait at least 24 hours before deciding.

Open the low-ROI detour

Move “Consider buying big-ticket items in the order “borrow, buy used, buy new” — don’t buy them all at once” to Future Me's calendar

Future Me has a clearer calendar, more patience, and apparently the same responsibilities.

Today I keep a little money, a few minutes, a bit of persistence and avoid interrupting my default routine.

Read the source and trade-off
20-012
Evidence AlifespanSource-sensitive

For children with severe eczema or egg allergy, don’t avoid peanuts — introduce them early under medical guidance, but never feed whole peanuts.

孩子有严重湿疹或鸡蛋过敏，别躲着花生，按医生指导早点加上，但绝不能喂整粒

In a randomized trial of 640 high‑risk infants, those who ate peanuts regularly from 4 to 11 months of age had a peanut allergy rate of only 1.9% by age 5, compared with 13.7% in the group that completely avoided peanuts. Among children already showing a weak positive skin test at enrollment, the rates were 10.6% versus 35.3%. Avoiding peanuts actually raises the risk of allergy. However, whole peanuts must never be given, as they can block the airway. A total of 530 infants had negative skin tests at entry, while 98 had weakly positive results.

Open the low-ROI detour

Move “For children with severe eczema or egg allergy, don’t avoid peanuts — introduce them early under medical guidance, but never feed whole peanuts.” to Future Me's calendar

If I do not open the notes, no new task has technically appeared.

Today I keep a little money, a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-013
Evidence BlifespanSource-sensitive

Watch newborn jaundice for these signals: yellow within 24 hours of birth, getting yellower, hard to wake or refusing feeds, pale stools — go to hospital the same day

盯住新生儿黄疸的几个信号：出生 24 小时内就黄、越来越黄、叫不醒不吃奶、大便发白，就当天去医院

More than four in five newborns have some jaundice; most clear on their own. Yellow before 24 hours of age, or getting yellower, unusually sleepy and hard to rouse, refusing feeds, or floppy or stiff — go to hospital the same day. Pale or white stools may mean biliary atresia; get checked quickly. Very high bilirubin can injure the brain and cause lifelong disability.

Open the low-ROI detour

Move “Watch newborn jaundice for these signals: yellow within 24 hours of birth, getting yellower, hard to wake or refusing feeds, pale stools — go to hospital the same day” to Future Me's calendar

One more exception feels free because the bill arrives outside the current scene.

Today I keep a little money, a few minutes and avoid interrupting my default routine.

Read the source and trade-off
20-014
Evidence BlifespanSource-sensitive

During vegan pregnancy or breastfeeding, discuss reliable vitamin B12 and infant feeding with a clinician

怀孕、喂奶时在吃素，就每天补维生素 B12；孩子的辅食要有动物性食物，非要全素先找医生

Vitamin B12 is scarce in unfortified plant foods. Untreated deficiency can harm infant growth and neurological development; the source recommends reliable B12 and appropriate complementary foods.

Open the low-ROI detour

Move “During vegan pregnancy or breastfeeding, discuss reliable vitamin B12 and infant feeding with a clinician” to Future Me's calendar

I can spend longer deciding whether to start than the small action would take.

Today I keep a little money, a few minutes, a bit of persistence and avoid interrupting my default routine.

Read the source and trade-off

Source snapshot: a994b6a0c90598b0fe15cb837343f438dbf7b95d. Every original stays available in Chinese alongside the English edition.