Something many people forget that kids are humans too and they need some cash to spend on things. We cannot change that but what you can do is make some extra cash online, It is simple to do and there are many ways such as :
You can also look for easy ways to make money for kids on the internet.
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Blogging: You simply create a blog and update it once a week or more with new content and in a year you can start to put some advertising, personal selling links, affiliate programs and other things to monetize your blog. But this is not feasible because it can take a long time before you actually make money.
Affiliate marketing: This is selling products from the internet. It can be yours or someone else and it can be done without any money at all or you can invest in PPC sites like AdWords but it's only once you get the hang of it.
Freelancing: You do everything. If someone wants you to write text, you correct it. If someone wants you to create a website for them, you make it. In order to do this job, you have to know a little about everything and a lot of HTML and PHP.
Online Surveys: This is the best way to make money for the children because it is the simplest and most pay. Plus you start to make money quickly and the only thing you need is a computer with an internet connection and your brain.
That's about all the ways to make money online if you are a child. Some are easy and some are not, but they are good ways.