Little or no head lag on being pulled to sit
3 months
Lying on abdomen with good head control
3 months
Held sitting with lumbar curve
3 months
Lying on abdomen arms extended
6 months
Lying on back grasping feet
6 months
Pulls self to sitting
6 months
Held sitting with back straight
6 months
Rolls from front to back
6 months
Sits without support
6-8 months (refer at 12)
Pulls to standing
9 months
Crawls
9 months
Cruises
12 months
Walks with one hand held
12 months
Walks unsupported
13-15 months (refer at 18)
Squats to pick up toy
18 months
Runs
2 years
Walks upstairs and downstairs holding rail
2 years
Rides a tricycle using pedals
3 years
Walks up stairs without rail
3 years
Hops on one leg
4 years