![Ng Han Guan FILE - A child wearing a mask pushes his bike during a quiet day at the East Lake Park in Wuhan in central China's Hubei province, April 2, 2020. Miniature bikes with no pedals seem to be everywhere these days, and the kids riding them are getting younger and younger. Experts recommend starting with those so-called balance bikes at a younger-than-expected age, possibly even less than a year old. (AP Photo/Ng Han Guan, File)](https://mapi.associatedpress.com/v2/items/139fc941b99f4d91a14b219a3c189bc0/preview/preview.jpg?s=680x&wm=false)
FILE - A child wearing a mask pushes his bike during a quiet day at the East Lake Park in Wuhan in central China's Hubei province, April 2, 2020. Miniature bikes with no pedals seem to be everywhere these days, and the kids riding them are getting younger and younger. Experts recommend starting with those so-called balance bikes at a younger-than-expected age, possibly even less than a year old. (AP Photo/Ng Han Guan, File)
![Annie Pezalla Jackson, left, and Owen Pezalla, both 4, appear on balance bicycles in Seattle on July 1, 2017. Experts recommend starting with those so-called balance bikes at a younger-than-expected age, possibly even less than a year old. (Annie Pezalla via AP)](https://mapi.associatedpress.com/v2/items/fd37993adbcc4f0eb2a7159f08c7cd30/preview/preview.jpg?s=680x&wm=false)
Jackson, left, and Owen Pezalla, both 4, appear on balance bicycles in Seattle on July 1, 2017. Experts recommend starting with those so-called balance bikes at a younger-than-expected age, possibly even less than a year old. (Annie Pezalla via AP)
![Andree Kehn FILE - Raven Kephart, left, rides her bike down a small hill as her little brother, Teagan, looks on, Oct. 7, 2020, in Auburn, Maine. Miniature bikes with no pedals seem to be everywhere these days, and the kids riding them are getting younger and younger. Experts recommend starting with those so-called balance bikes at a younger-than-expected age, possibly even less than a year old. (Andree Kehn/Sun Journal via AP, File)](https://mapi.associatedpress.com/v2/items/a55c410a29834c819e82265418d99ecd/preview/preview.jpg?s=680x&wm=false)
FILE - Raven Kephart, left, rides her bike down a small hill as her little brother, Teagan, looks on, Oct. 7, 2020, in Auburn, Maine. Miniature bikes with no pedals seem to be everywhere these days, and the kids riding them are getting younger and younger. Experts recommend starting with those so-called balance bikes at a younger-than-expected age, possibly even less than a year old. (Andree Kehn/Sun Journal via AP, File)