You can get Whole Life Insurance on a Child for very little money, so larger amounts of life insurance coverage are possible.
Most parents do not expect their children to die.
Life insurance on your children is more about Guaranteed Insurability.
You never know when your child may develop a childhood disease, be in an accident, or develop childhood diabetes.
Once any of these things happen, your child might become uninsurable, meaning they could never get life insurance on themselves in the future, to protect their own families one day.
If you gave them Life Insurance as a child, and it was continued into adulthood, with the guaranteed, locked-in very low rate, your child is now able to continue to have life insurance protection for the rest of their lives. No matter if their health changes or they have a high risk job one day, or take part in high risk hobbies.