The child was struck from behind while walking along the pavement with his grandmother.
The rider of the electric scooter fell off during the crash but remounted and fled from the scene in Feltahm High Street, west London at around 6pm on Saturday.
Paramedics took the boy to hospital and he has since been discharged.
Police have now launched an investigation into the crash and are asking for anyone who saw it, or has dashcam footage, to come forward.
A Scotland Yard spokesperson said: Police were called at 6pm on Saturday, April 17 to reports of a collision at High Street (A244), near the junction with Manor Lane, Feltham.
UK Parliament
Have your say on the Police, Crime, Sentencing and Courts Bill
6 May 2021 2021
Do you have relevant expertise and experience or a special interest in the Police, Crime, Sentencing and Courts Bill 2021-22, which is currently passing through Parliament?
If so, you can submit your views in writing to the House of Commons Public Bill Committee which is going to consider this Bill.
The first sitting of the Public Bill Committee is expected to be on Tuesday 18 May. Written evidence can now be sent in to the Public Bill Committee which will be set up when the Bill is re-presented to the House in the new Session. The Committee is scheduled to report by Thursday 24 June.
River bank blighted by rubbish traced to home 60 miles away
She failed to attend several court appearances
Updated
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A Sheffield woman has been ordered to pay a hefty fine after household waste was found dumped in East Yorkshire.
Jodie Kimpton, of Dryden Drive, pleaded guilty to an offence under Section 34 of the Environmental Protection Act 1990, having failed to take reasonable measures to ensure that her waste was disposed of in accordance with the law.
Top speeding fine questions from whether cameras flash to how much fines will cost you
6,000 people were caught speeding every day in the UK last year
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The most searched for questions about speeding fines have been revealed, after thousands of people were caught going over the speed limit last year.
Common speeding questions answered - including fines, national speed limit and points
Fines for speeding hit a record high last year
10:07, 30 APR 2021
File photo of a speed camera. (Image: Ian West/PA Wire)
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More than 6,000 motorists were caught speeding every day in the UK last year, according to the Home Office.