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Going by the photo, it looks like some kind of integrated headset that uses loose balls rather than sealed bearings.
It should be a pretty generic headset bearing cage, however I'm not entirely sure which physical shops would keep them now. If you have a local bike shop that does lower end bikes, they're the most likely to keep them.
Simply bearings list a couple Weldtite options, but you'll need to measure the balls - Loose Balls and Cages at Simply Bearings - Bike Bearings and Cages - High Qualit
Alternatively you could order some loose balls, and stick them in with grease. Put enough balls in that the race is full, then remove one. The reasons they use a cage is for convenience for assembly, and you need less balls as the cage stops them all rolling to the one side.
Cannondale Semi Integrated Straight 1 1/8in Headset, 28.6/44/30, (2020+ Trail with Straight 1 1/8 headtube), K35020 (cannondalespares.com)
They do go eventually. Looks like quite a new bike though?
If anybody will do one, it'll be FSA - FSA – EasyHeadset (fsaeasyheadset.com)
However given it's a kids bike, provided the bearing races are fine, I'd just replace the bearings and pack them with a decent grease, as headsets can get relatively expensive.
One thing puzzles me though, how do you tension the bearings on a none threaded fork? The old type had a big nut to tension the bearings and keep them located, does this system rely on the spacers and stem to keep the bearings all located and tight?
My wife cycles thousands of miles a year and I have to go through every moving part every six months on both of her bikes.
One thing you learn very quickly in the 21st century cycling world is that you're supposed to buy this year's colour every season and if you must actually ride the damn things, don't do it in the rain or frost.
https://simplybearings.co.uk/shop/Cycling-/-Biking-Bike-Bearings-Caged-Ball-Bearing-Races/c5409_5413_5416/index.html?selection=Head+Race+Ball+Cages
A new Cane Creek or FSA or similar headset with cartridge bearings is not expensive, and any decent bike shop would fit one in minutes.
I just had the new bits delivered today so should have it all together by the week end, spanners are on the car at the moment though, Impending MOT so new exhaust, steering box, hand brake rebuild, rear prop UJ, front hub rebuild, and thats the bits I know about, Oh, wiring issues too! Its going to be a busy Easter break!