Child in pram kicked in face in Sydney

A man has been charged after he alleged kicked a toddler in the face in Sydney's CBD.

The parents of a three-year-old boy, who was in a pram, were walking along King Street about 11.30pm on Friday when an unknown man approached them with a number of demands before he allegedly kicked the boy in the face and ran.

The boy's father chased after the 18-year-old man, but he lost sight of him and called police.

Officers located the alleged assailant in Martin Place just over an hour later after security guards contacted police about his erratic behaviour.

He is set to face Parramatta Bail Court on Saturday charged with assault occasioning actual bodily harm.

The toddler was taking to Sydney Eye Hospital for treatment to a cut lip and facial swelling.