Weight shift to skull side may begin6
Prone head turn independent of shoulder girdle6
Puppy position, prone on elbows and forearms (POE)1,6,14
Weight on ulnar border of forearm with shoulders adducted1
Alternates between prone on elbows and pivot prone1
Occasionally bears weight on extended arms1
Alternates between extension and flexion in lower extremity1
Rolls from prone to side-lying (often accidentally)1,6,14
Hips extension with weight on hips1
Head centered and upright to 90 degrees1, 14
Pivot prone begins - rocking1
Tends to fall to side and on back1
Hips more adducted, less external rotation1
Lower extremity extension symmetrically14
Lower extremity movement mirrors upper extremity movement1
Pelvis to surface to lift chest1
May roll prone or supine to side-lying
When shoulders adducted in prone on elbows, weight shifts to ulnar border of forearms
Head held midline 90 degrees; no unilateral reaching in prone on elbows
In prone, hips more adducted and less external roation than 3 months; extend symmetrically