The death benefit, premium, and PUA rider are all proportional. Meaning that since the child’s death benefit is low, the premium is low, so the PUA rider is low. Example: A 5-year-old boy (gender does matter, though not by much) might have a $100,000 death benefit, an annual premium of $700, and a maximum PUA of about $700.
As the policy owner, you’ll have full use of the cash value. And, of course, you can make anyone but the insured, the beneficiary.