This is Krishna crawling with a ball of butter in his right hand. He is protected by a seven-hooded cobra. 

This scene depicts one of his mischiefs. Being fond of butter he steals butter and runs away from his chasing foster mother Yasodha. 

This idol is only 5 cm in height and a lot of work for a bronze of this size.

Given the alloy composition and the casting quality, this is most likely from Tamil Nadu.  Crawling Krishna is a regular feature of Vaishnavite household altar. 

This probably dates to the nineteenth century.