My kid purchase a lot of toys without my permission.
With the help of the internet, we can easily buy stuffs online. When your credit card account is linked to your amazon, or other online shops you can purchase those things that you want. Kids can also easily purchase the toys they want and use your credit card. They are young but know how to use the internet this days.
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Cancel the purchase as soon as possible, so that it won't be credited at your account. What if it already came and I just lately knew about it? Contact the shop that you brought from and file a complain or a refund. They should be able to help you wth the chargeback. Always keep an eye on your kids to ensure what they are viewing on the internet.