Without a will, the Public Guardian and Trustee becomes the trustee and holds the child’s shares in trust for them until they’re 19 years old. The child’s parent or guardian would have to apply to the Public Guardian and Trustee for any money needed for things like living expenses or education. This can be a hardship if the child is quite young and the parent or guardian needs the money for day-to-day expenses.
When the child turns 19, they can demand all of their money no matter how much it is, regardless of their maturity or financial responsibility. By contrast, if you have a will, you appoint the executor and trustee for the share going to a child under 19, and you can direct that the share be used for the child’s benefit, including support and higher education, without government involvement.