Hi there !
I understand your concerns for your son. I am sorry to hear that the variable spots on his tummy are very prominent and are concerning to you. I wonder if they are not infection. Warty lesions are usually present on the extremities of the body, however the lesions on the tummy are concerning and you seem to want to have these taken care of very soon. A visit with a pediatric dermatologist
might help. Keeping the baby clean is another way to deal with issues. I hope this helps. Take care and have a lovely day!