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🌱 Developmental stages

🍼Infant

From one month to twelve months — motor milestones, first foods, attachment deepening, and emerging sleep patterns.

Also called: Baby · First year

OverviewOrigins & EvolutionWhat the science saysDaily practiceCulture & meaningGuides & thinkersMyths vs evidenceAround the world
Frequently asked questions

Media credits

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Six-month-old infant sitting with support
Kimberly Vardeman · CC BY 2.0
At a glance
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909678258580
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Timeline

Milestones in order. This is history, not a weekly activity grid.

1934 Piaget stages1946 Spock bestseller1969 Strange Situation1975 Liedloff Continuum1985 Back to Sleep prep2001 WHO exclusive BF2010 Three-stratum model2016 AAP solids update2020 COVID isolation2024 Allergen introduction
  1. Piaget stages
  2. Spock bestseller
  3. Strange Situation
  4. Liedloff Continuum
  5. Back to Sleep prep
  6. WHO exclusive BF
  7. Three-stratum model
  8. AAP solids update
  9. COVID isolation
  10. Allergen introduction
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Newborn / Toddler
18 min read

Last reviewed Sources & creditsMedia creditsMethodology

Start with this section - Origins & Evolution

Quick facts

1–12 monthsAge span
Rolls ~4–6 moMotor
WHO ~6 mo startSolids
12–16 hrs/daySleep
Babbling ~6–9 moWords
Stranger anxiety ~8 moAttachment

The infant year spans rapid motor, cognitive, and social growth from dependent newborn to mobile, communicative near-toddler.

Piaget's sensorimotor stage and later attachment research frame this period as active learning through movement, mouth, and reliable caregivers.

WHO complementary feeding guidance, AAP safety standards, and global vaccination schedules intersect with daily parenting choices.

The profile

909678258580
  • Evidence strength90
  • Daily impact96
  • Difficulty78
  • Age span25
  • Expert consensus85
  • Urgency80

Age range

80 / 100

1–12 months

From one month to twelve months — motor milestones, first foods, attachment deepening, and emerging sleep patterns.

Seven ways into this topic

01

Origins & Evolution

From one month to twelve months — motor milestones, first foods, attachment deepening, and emerging sleep patterns.

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 02

What the science says

Evidence on infant from developmental science.

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 03

Daily practice

Concrete steps for infant in daily family life.

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 04

Culture & meaning

How societies frame infant across eras and media.

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 05

Guides & thinkers

Researchers and practitioners who shaped thinking on infant.

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 06

Myths vs evidence

Common misconceptions about infant checked against evidence.

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 07

Around the world

Global variation in infant norms, policy and practice.

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Frequently asked questions

What is Infant?
The infant year spans rapid motor, cognitive, and social growth from dependent newborn to mobile, communicative near-toddler.
How do I start with Infant?
Tummy time daily — Short supervised sessions on firm surface build strength. — Place toys slightly out of reach to motivate lifting.
What is the next practice step for Infant?
Prepare solids gear — High chair, soft spoons, bibs — watch for sitting stability and interest signals. — Continue milk as primary nutrition.
What does research say about Infant?
Secure base — Infants use caregivers as secure base for exploration; sensitivity predicts classification in Strange Situation.
Myth check: Cereal in bottle aids sleep
No robust evidence; adds calories without teaching self-regulation and may choke.
Which ages does Infant matter most for?
Infant is most relevant for 1–12 months.
How does Infant look around the world?
West Africa — Back carrying — Cloth wraps keep infants upright against caregiver during work — thermoregulation and bonding.
When do infants roll over?
Many roll front-to-back between 4–6 months; wide normal range exists — tummy time supports development.

Also worth reading

Cross-category companions chosen for this topic — not more of the same shelf.

😴

Sleep

Circadian development, night waking, and safe sleep environments — among the most researched and debated parenting topics globally.

Evidence 91 🍽️

Feeding

Breast, bottle, solids, and picky eating — Ellyn Satter's division of responsibility frames feeding as a relational not battlefield task.

Evidence 93 🎲

Play & Connection

Play is the language of attachment — child-directed play builds trust, reduces behaviour problems, and teaches social rules.

Evidence 84 🤗

Attachment Parenting

Proximity, responsiveness, and physical closeness — attachment parenting emphasises cue-based care popularised by William Sears.

Evidence 75 🧸

Toddler

Walking, talking, and testing limits — the toddler years blend motor explosion, language bursts, and autonomy struggles.

Evidence 85 👁️

Presence

Quality of attention over quantity of hours — presence means undistracted engagement, not perfection or constant entertainment.

Evidence 72 🧘

Self-Regulation

Managing one's own arousal before guiding a child — parental self-regulation mediates the impact of stress on discipline quality.

Evidence 87

Wider pathways

Village and rolesBodies, nights, loadFirst thousand days

Deep reads on this theme

It takes more than two: alloparenting and the villageThe attention economy at homeDifferent children: temperament, neurodiversity and fair expectationsFed but unseen: emotional neglect and the quiet wound

Situations that include this

Bedtime battlesPlay first

Collections that include this

The first yearCalm nightsVillage networkAttention at homeEarly bridge

Nearby ages & themes

👶

Newborn

The first 28 days after birth — physiology, bonding, feeding rhythms, and the shift from womb to world.

Evidence 88 🧸

Toddler

Walking, talking, and testing limits — the toddler years blend motor explosion, language bursts, and autonomy struggles.

Evidence 85 ✏️

Preschool

Imaginative play, peer entry, and executive function growth define the preschool years before formal schooling.

Evidence 82 📚

School Age

Industry, friendships, and academic skill-building mark middle childhood between toddler chaos and adolescent identity work.

Evidence 78 🧑‍🎓

Teenager

Brain remodeling, identity formation, and increasing autonomy define adolescence — risk and capability both rise.

Evidence 80