The arrest follows a Metropolitan Police appeal to track down the man after a five-year-old boy was approached on Friday (June 25) while walking home from school in Tower Hamlets.
It’s claimed a stranger followed the boy, who was unharmed in the incident, before trying to grab him by the hand.
The boy, who was with two other family members, managed to get to a family friend’s home to alert the police after the alleged incident.
A police spokesperson said: “We thank the media and the public for sharing the appeal.”
Earlier this week, the Met said they were not aware of any similar or connected incidents and officers are keeping an open mind about the motivations behind the incident.
Police had said there will be an increased police presence in the area at key times this week, including school drop off and pick up periods.
It comes after a teenage girl in uniform was grabbed and nearly abducted by two men on her way to school earlier this month.
The victim, a girl aged in her mid-teens, was walking along North Countess Road, in Walthamstow, northeast London when she was approached by a stranger.
She told police a white Kia with muddy tyres stopped near her about 8.30am on Wednesday, June 16.
A man she did not know got out of the passenger seat and grabbed her but she fought back and managed to break free from his grasp.
The terrified girl ran to nearby Walthamstow Academy to report the attack to staff.
The Met described the suspect as Asian, aged about 20, 6ft tall, of medium build with short black hair.