The World Health Organization (WHO) has published age ranges for the achievement of gross motor milestones during normal development.
Gross motor milestones:
(1) sitting without support
(2) standing with assistance
(3) crawling on hands and knees
(4) walking with assistance
(5) standing alone
(6) walking alone
Sitting without Support
|
Age in Days |
Percentage |
|
< 115 days |
< 1st percentile |
|
115 to 179 days |
(0.01027 * ((days)^2)) - (2.25 * (days)) + 123.7 |
|
179 to 279 days |
(-0.005977 * ((days)^2)) + (3.218 * (days)) - 334.1 |
|
> 279 days |
> 99th percentile |
Standing with Assistance
|
Age in Days |
Percentage |
|
< 147 days |
< 1st percentile |
|
147 to 226 days |
(0.006761 * ((days)^2)) - (1.897 * (days)) + 133.5 |
|
226 to 348 days |
(-0.004063 * ((days)^2)) + (2.722 * (days)) - 356.8 |
|
> 348 days |
> 99th percentile |
Crawling on Hands and Knees
|
Age in Days |
Percentage |
|
< 157 days |
< 1st percentile |
|
157 to 254 days |
(0.005694 * ((days)^2)) - (1.838 * (days)) + 149.4 |
|
254 to 409 days |
(-0.002995 * ((days)^2)) + (2.281 * (days)) - 334.3 |
|
> 409 days |
> 99th percentile |
Walking with Assistance
|
Age in Days |
Percentage |
|
< 181 days |
< 1st percentile |
|
181 to 275 days |
(0.00621 * ((days)^2)) - (2.318 * (days)) + 217.5 |
|
275 to 418 days |
(-0.00347 * ((days)^2)) + (2.727 * (days)) - 435.9 |
|
> 418 days |
> 99th percentile |
Standing Alone
|
Age in Days |
Percentage |
|
< 211 days |
< 1st percentile |
|
211 to 330 days |
(0.003794 * ((days)^2)) - (1.644 * (days)) + 179.2 |
|
330 to 514 days |
(-0.002113 * ((days)^2)) + (2.034 * (days)) - 389.5 |
|
> 514 days |
> 99th percentile |
Walking Alone
|
Age in Days |
Percentage |
|
< 250 days |
< 1st percentile |
|
250 to 365 days |
(0.004159 * ((days)^2)) - (2.137 * (days)) + 275.6 |
|
365 to 534 days |
(-0.002461 * ((days)^2)) + (2.486 * (days)) - 528.1 |
|
> 534 days |
> 99th percentile |
Specialty: Pedatrics
