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 |