18 Months
Heel strike emerges
Reciprocal arm swing in 50%
Increased walking speed (78%)
2 Years
Knee flexion during stance phrase
7% can walk on a balance beam sideways (10x3cm)
30 Months
Most toe and heel walk
5% hop forward on one foot
3 Years
Running with non-support emerges
Cadence = 153 steps/min (7 Years = 143 steps/min, Adult = 114 steps/min)
Walking velocity = 86cm/sec (7 Years = 114cm/sec, Adult = 122cm/sec)
42 Months
Base of support is equal to or less than pelvic span
4 Years
Reciprocal arm swing firmly established
Most can walk a balance beam
Most can hop
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