| Gross Motor |
Mean age |
Normal Range |
| In prone head up only |
1 month |
0 to 3 months |
| Head steady at shoulder |
2 months |
1 to 4 months |
| In prone head up to
chest |
2 months |
1 to 4 months |
| In prone head up to
forearms |
3 months |
2 to 5 months |
| In prone head up with
extended arms |
4 months |
3 to 6 months |
| Rolling front to back |
4 months |
3 to 6 months |
| Rolling back to front |
5 months |
4 to 7 months |
| Sitting with support |
5 months |
4 to 7 months |
| Sitting independently |
6 months |
5 to 9 months |
| Creeping on tummy |
7 months |
5 to 10 months |
| Crawling hands and knees |
8 months |
6 to 11 months |
| Pulls to a stand |
9 months |
6 to 12 months |
| Cruises |
11 months |
9 to 14 months |
| Walking |
12 months |
9 to 17 months |
| Running |
15 months |
13 to 20 months |
| Jump on two feet |
24 months |
17 to 34 months |
| Kicks Ball |
24 months |
18 to 30 months |
| Climbs stairs with
alternating feet |
30 months |
28 to 36 months |
| Peddles tricycle |
36 months |
30 to 48 months |
| Fine Motor/Adaptive |
Mean |
Normal Range |
| Unfisted |
3 months |
0 to 4 months |
| Bats at objects |
3 months |
2 to 5 months |
| Objects to midline |
4 months |
3 to 6 months |
| Transfers objects |
5 months |
4 to 7 months |
| Raking grasp |
7 months |
5 to 10 months |
| Finger feeds |
7 months |
5 to 10 months |
| Primitive pincer |
8 months |
6 to 10 months |
| Neat pincer |
9 months |
7 to 10 months |
| Voluntary release |
12 months |
10 to 15 months |
| Helps with dressing |
12 months |
10 to 16 months |
| Spoon feeds |
15 months |
12 to 18 months |
| Uses cup open/sippy |
15 months |
10 to 18 months |
| Imitates housework |
18 months |
14 to 24 months |
| Handedness |
24 months |
18 to 30 months |
| Helps with undressing |
24 months |
22 to 30 months |
| Undresses self |
36 months |
30 to 40 months |
| Toilet training |
|
24 to 36 months |
| Social/Emotional |
Mean |
Normal Range |
| Social smile |
5-6 weeks |
1 to 3 months |
| Object
permanence |
9 months |
6 to 12 months |
| Stranger
anxiety |
9 months |
6 to 12 months |
| Affective
sharing |
10 months |
9 to 18
months |
| Uses mother as
secure base |
12 months |
9 to 18 months |
| Separation
distress |
12 months |
9 to 24 months |
| Independence |
18 months |
12 to 36 months |
| Parallel play |
24 months |
12 to 30 months |
| Associative
play |
30 months |
24 to 48 months |
| Cooperative
play |
36 months |
24 to 48 months |
| Language |
Mean |
Normal Range |
| Cooing |
3 months |
1 to 4 months |
| Laugh |
4 months |
3 to 6 months |
| Turns to voice |
4 months |
3 to 6 months |
| Razzing |
5 months |
4 to 8 months |
| Babbling |
6 months |
5 to 9 months |
| Dada/mama
non-specifically |
8 months |
6 to 10 months |
| Gesture games |
9 months |
7 to 12 months |
| Understands no, |
10 months |
9 to 18 months |
| Mama/dada
specifically |
10 months |
9 to 14 month |
| One step
command with a gesture |
12 months |
10 to 16 months |
| Immature
jargoning |
13 months |
10 to 18 months |
| One step
command w/out a gesture |
15 months |
12 to 20 months |
| Points to body
parts |
18 months |
12 to 24 months |
| Mature
jargoning |
18 months |
16 to 24 months |
| Puts two words
together |
24 months |
20 to 30 months |
| Pronouns
inappropriately |
24 months |
22 to 30 months |
| Two step
command |
24 months |
22 to 30 months |
| States first
name |
34 months |
30 to 40 months |
| Pronouns
appropriately |
36 months |
30 to 42 months |
