Two people have been arrested on suspicion of child neglect after the was spotted walking along the seafront in 60mph winds in the early hours of yesterday morning.
A passerby said he saw the un-named child walking with two “intoxicated men” on the beach.
Another witness said they saw the young boy “picking up needles” from the street for a woman he was with.
Brighton Beach Patrol and Sussex Police rushed to scene and were involved in bringing the child to safety at about 2am.
A Sussex police spokesman said: “The investigation is ongoing, and for this reason we would urge members of the public not to speculate around the circumstances.”
The child is in police protection.
Louise from Brighton Beach Patrol said: “I can confirm the beach Patrol Located the child at 2am.”