Infants at 4-6 months

Over the 4-6 month period infants start to interact with the environment in a more purposeful manner as they gain upright control of the head and trunk, begin to move about independently in prone, and  use their hands to actively explore the properties of objects. 

Overview of development at 4-6 months

Head control and pull-to-sit    Pull-to-sit birth to 4 months    
Supine development     5 months   5-7 months 
Sitting   4 months    5 months    6 months
Prone  to early prone kneeling   5 months   6 months   5 months   5-6 months videos
Hand function  Foundation manual behaviors birth-5 months    Will at 4 months   Will at 5 months 

Assessment and intervention strategies and training 
Supine head control: assessment and training
Sitting   Assessment overview 
Prone    Assessment and intervention strategies 
Hand function  Observation and assessment guidelines 

More resources 
Pathways video   Assessment at 6 months typical and atypical development 
DR Glen Trip        Your baby at 4 months 
Dr Gln Trip           Your baby at 6 months - video