Teen stabbed in Sydney's west

A 16-year-old boy has been stabbed in the stomach during a brawl at a unit block in Sydney's west.

Emergency services were called to the block in Guildford just before 7.50pm on Saturday to find the boy with a head laceration and the stab wound.

He was taken to Westmead Hospital in a stable condition and was to undergo surgery.

Police say initial inquiries suggest the teen was injured following an altercation with a group of males who fled the scene.