Don't name a beneficiary
In the absence of a beneficiary the proceeds of the policy will be paid to your estate. They will then be distributed in accordance with your will. Your will should establish a testamentary trust for the child for which you will establish the terms (for example, the will can consider things like living and education expenses and when the trust will end and the child can access the money directly) and name the trustee(s) in the will (and how they get replaced if they die or refuse to continue as a trustee).
The trustee is legally obligated to manage the funds in accordance with whatever terms you wrote into the trust for the benefit of the child. This should be someone you trust to a) do the right thing and b) manage the money wisely. You should also make provision in the trust to pay the trustee for their services. Most governments have a public trustee who will do this stuff for a fee.
You will need both professional legal and accounting advice to do this properly. A good lawyer should be able to "future proof" the will by considering that you might marry in the future and/or have other children (or that the first (or any other) child may predecease you) and writing it to deal with those eventualities.