My 10-month-old daughter was born full-t
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My 10-month-old daughter was born full-term at 39 weeks. We live in Phoenix, Arizona (US).
She sits upright independently without support, rolls in both directions, and pivots in circles on her tummy, but she does not crawl on hands and knees (creeping). When she wants a toy across the room, she pulls herself on her belly (commando/army crawl) or rolls toward it.
My mother-in-law visited this weekend and told me: "All normal babies must crawl on hands and knees by 9 months. If she skips crawling, her brain hemispheres won't connect properly and she'll have reading difficulties in school."
Now I am constantly worried and feeling guilty.
1. Is hands-and-knees crawling a required milestone on the CDC developmental checklists, and what does the WHO motor development window say about hands-and-knees crawling?
2. What are the actual CDC gross motor milestones for 9 to 12 months?
3. What dated observations should I record for her upcoming 12-month well-child pediatric visit?
Answer
I'll get your daughter's profile and pull the right reference cards for a 10-month-old's motor milestones.
Let me check the visit-notes reference for the right format of observations.
**No — hands-and-knees crawling is not on the CDC 9-month or 12-month milestone checklists, and the WHO motor-development window for it runs 5.2–13.5 months; your daughter at 10 months is well inside it.** About 4.3% of healthy children in the WHO sample never crawled on hands and knees at all, and the WHO/CDC sources do not connect skipped crawling to later reading difficulty. What your daughter is doing (sitting alone, rolling both ways, pivoting, commando-crawling and rolling across the room to reach a toy) is the active locomotion the 9-month card calls "crawl/scoot/roll." Your mother-in-law's "hemispheres won't connect" claim isn't something the source cards say.
**CDC 9-month gross motor (75%+ of babies do these)** — your daughter is meeting all of them.
- Gets to a sitting position by herself
- Moves things from one hand to her other hand
- Uses fingers to "rake" food toward herself
- Sits without support
Source: https://www.cdc.gov/act-early/milestones/9-months.html
**CDC 12-month gross motor (75%+ do these by 1 year)** — these are the next two months' runway.
- Pulls up to stand
- Walks holding onto furniture
- Drinks from a cup you hold
- Picks things up between thumb and pointer finger
Source: https://www.cdc.gov/act-early/milestones/1-year.html
**WHO window for hands-and-knees crawling**
- 1st–99th percentile: **5.2–13.5 months** (population variation, not a home percentile, not a pass/fail line)
- About 4.3% of this healthy sample never showed hands-and-knees crawling
- The six gross-motor skills don't arrive in lockstep, and crawling is not required before walking
- Later than the 99th percentile is a reason to ask a clinician about screening — not a diagnosis
Source: https://www.who.int/tools/child-growth-standards/standards/motor-development-milestones
| Date | Dated observation to bring to the 12-month visit |
| --- | --- |
| 2026-09-16 | 10 months, full term (39 wk); sits independently; rolls both directions; pivots on tummy; commando-crawls and rolls to reach a toy; does **not** crawl on hands and knees |
| 2026-09-16 | Family worry raised by grandparent visit: "won't crawl → reading difficulty" — not a finding on the CDC or WHO cards |
| 2026-09-16 | eacts to her name, looks when called, smiles at peek-a-boo (from your description of the 9-month social items) |
**At the 12-month well-child visit** (already on the calendar), hand the dated observations above to the pediatrician and ask for a formal developmental screening. The AAP US schedule is general screening at 9, 18, and 30 months — **and also whenever the family is concerned**, which fits here. The visit you already have is where that request gets made; no need to wait for a later one. If anything still feels unresolved after the visit, the CDC says: ask for a specialist referral and ask about local early-childhood services.
Source: https://www.cdc.gov/act-early/about/developmental-monitoring-and-screening.html
Is she starting to pull herself up to stand, or walking sideways while holding onto furniture yet?