Birth to 1 month (Gross development)

When they focus on head control
Prone
- Physiological flexion
- Able to lift head for a short time
- Able to move head side to side
Supine
- Physiological flexion
- Somewhat able to roll side to side
Sitting
- Head lag when being pulled to sit
- Needs support to sit
Standing
- If standing or walking it is base on reflex NOT control

2 to 3 months (Gross development)

Prone
- Life head to 90 degrees for a short time.
- Chest up in prone with some weight through UE's
- Able to roll prone to supine
Supine
- ATNR is strong
  - Asymmetric tonic neck reflex
  - When the head turns the arm it is looking at extends and so does the leg
  - The opposite arm and leg are in flexion
- Kicking of legs
- Head side to side movements
Sitting
- Still head lag
- Still needs support to sit
Standing
- Still reflex base but can WB poorly though

4 to 5 months (Gross development)

Prone
- Able to WB on extend elbows
- Pivots for movement such as to reach toys
Supine
- Able to roll from supine to sidelying
- Able to put feet in mouth
Sitting
- Stable head and is able to do sitting by themselves for a short time
- Learning to turn head
Standing
- Able to WB but only through legs with support

6 to 7 months (Gross development)

Prone
- Able to roll from supine to prone as well
- Able to be prone on elbows with one UE while reaching with the other
Supine
- Able to lift head and have control
Sitting
- Able to sitting independently with UE support
Mobility
- Able to crawl backwards

8 to 9 months (Gross development)

Prone
- Able to get into hands knee position (kneeling with UE support)
Supine
- Doesn't want to be in this position anymore
Sitting
- Able to go from prone to sit
- Able to sit without UE's support
- Pivots in this position
Mobility
- Crawling or cruising (walking along furniture)

11 months (Gross development)

Standing
- Stands without support
- Able to pick up objects with support
- Uses half-kneel position to get into standing now
Mobility
- Walks with 1 or 2 hands
- Or bear walks

12 to 15 months (Gross development)

16 to 24 months (Gross development)

2 years (Gross development)