: Bike rear seat for > 22kg special needs child Following this comment https://bicycles.stackexchange.com/questions/50645/max-weight-of-child-for-rear-bike-seats-why-is-it-always-seemingly-22kg/51534?noredirect=1#comment159389_51534

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If your child is able to, I'd suggest a "third wheel" style, where you attach a second full seat and a third wheel behind your bike with a pedal and everything. "Trail-a-bike" is one brand, but there are others. This worked well for me with my five year old who was learning to ride but also wanted to go on longer trips with me; he was probably in that ballpark size-wise at the time.
This does require them being able to sit on the seat and stay there, and not be too unpredictable with their motions - if they are too unpredictable, they might make you fall over - and at least the ones I've used don't have any sort of buckles, so they have to be capable of choosing to stay on the bike. So, this will be appropriate for some, but not all, autistic children.
Much of this though depends on your child. I have a friend with a moderately autistic child, and around the same age was able to learn to ride - and in fact loves it, it's their favorite thing to do basically. If both riding for himself, and the trail-a-bike, is too much, then you may want to consider a bike trailer. Bike trailers often are built for two children, and while generally the "per child" weight is less (like 15-25 kg), I suspect you can find one that would work for a somewhat larger child (though with some limits, still.)