cyclists protective head gear for children bill.... well thats gonna stop a lot of kids from cycling.
(my opinion based on no facts other than personal experience)
But backed up by facts. It did in Australia and New Zealand. Up to 90% reduction. And there were fewer kids riding with helmets after the law than before despite the wearing rate going up in response to the law.
The beauty of this particular law is the proposed punishment is to show the police proof of helmet purchase within 28 days of being stopped or face a fine. Any child with a head worth protecting will be able to work out they can buy a helmet on line, show the helmet and receipt and then return it within 7 days for a full refund. Its what the students in Oxford did when the police tried a similar strategy for riding without lights.