My baby missed a few items — is that okay?

Development is a spectrum — ±2–3 months variance at the same age is normal. Fewer than 2–3 misses in one domain is observational; full-domain misses or any red flag warrant a pediatric consult.

CDC vs Korean Pediatric Society — which?

The tool shows items that both guides agree on first. For pediatric visits in Korea the Korean Pediatric Society guide is the working standard, so the printable PDF defaults to it.

How do I count age for a preemie?

Use corrected age (counted from the due date) until at least 24 months — that is the pediatric standard. Toggle the corrected-age switch in the result.

Do boys and girls develop differently?

On average, girls run 1–2 months ahead in language/social and boys lead in gross-motor volume — all within normal variance. The tool applies a single, gender-neutral standard.

Is this a medical diagnosis?

No — it is a parental self-assessment aid. Formal diagnosis and treatment must come from a pediatrician or developmental clinic.

Parenting · 🌏 Global

Baby Milestone Checklist

LIVE

4-domain (motor, language, social, cognitive) milestone checklist by age, with standard-range comparison.

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About this tool

Baby Milestone Checklist is a free self-assessment tool covering 4 domains (gross/fine motor, language, social-emotional, cognitive) across 13 age bands (2, 4, 6, 9, 12, 15, 18, 24, 30, 36, 48, 60 months) for babies 0–60 months old. It is built on CDC "Learn the Signs. Act Early." (2022 revision), the Korean Pediatric Society guide, WHO motor milestones, and the KDCA infant-health-checkup standard. Enter the baby’s DOB and the current age band’s checklist appears with red-flag items highlighted — e.g., "no pointing with one finger by 12 months" — so you know when a pediatric consult is warranted. Checkbox state is saved to localStorage; printable PDF for pediatric visits and bilingual KO/EN UI included. Everything runs in your browser.

Use cases

Scenario 1

Prep for the 12-month checkup

Before the 1-year well-baby visit, parents pre-fill the 4-domain checklist so the doctor gets a precise picture and any gaps go to the top of the K-DST assessment.

Scenario 2

Preemie corrected-age toggle

For preterm babies, switch on the corrected-age toggle (counted from due date) and evaluate milestones by corrected age until 24 months.

Scenario 3

Suspected language delay

If an 18-month-old uses fewer than 5 words (a language red flag), print the checklist and bring it straight to a pediatric developmental clinic.

Scenario 4

24-month K-DST self-assessment

Run a K-DST-style at-home checklist before the 24-month visit to gauge domain balance — especially social and cognitive.

Scenario 5

48-month school-readiness check

Before kindergarten/elementary entry, check school-readiness milestones in cognition and social skills (scissors, writing name, taking turns).

Features

13 age bands from 0–60 months (2, 4, 6, 9, 12, 15, 18, 24, 30, 36, 48, 60)
4-domain split (gross/fine motor, language, social, cognitive)
Red-flag highlighting per age band
Checkbox state auto-saved to localStorage
Printable PDF for pediatric visits
Preemie corrected-age toggle (until 24 months)
Bilingual KO/EN — multicultural-family friendly

Frequently asked

Q. My baby missed a few items — is that okay?: A. Development is a spectrum — ±2–3 months variance at the same age is normal. Fewer than 2–3 misses in one domain is observational; full-domain misses or any red flag warrant a pediatric consult.
Q. CDC vs Korean Pediatric Society — which?: A. The tool shows items that both guides agree on first. For pediatric visits in Korea the Korean Pediatric Society guide is the working standard, so the printable PDF defaults to it.
Q. How do I count age for a preemie?: A. Use corrected age (counted from the due date) until at least 24 months — that is the pediatric standard. Toggle the corrected-age switch in the result.
Q. Do boys and girls develop differently?: A. On average, girls run 1–2 months ahead in language/social and boys lead in gross-motor volume — all within normal variance. The tool applies a single, gender-neutral standard.
Q. Is this a medical diagnosis?: A. No — it is a parental self-assessment aid. Formal diagnosis and treatment must come from a pediatrician or developmental clinic.

Sources / references

Related guides / blog posts

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How we run it / disclaimer

This tool is advisory and does not constitute legal, tax, medical, or financial advice. All calculations and document generation run in your browser; inputs are never sent to a server. Ads follow Google AdSense policy and are kept separate from tool accuracy.