Was David's seven-day-old baby secure and in God's presence after he died?
Yes. The seven-day-old child was secure and in God's presence. David did not speak of going to hell but of heaven, and he anticipated going to the child again someday. That hope shows the baby was safe with God after death.
Les explains that the answer was a seven-day-old baby, and he asks whether it was secure and in God's presence. The answer is yes, because David did not speak of going to hell; David is going to be in heaven. When David thought of that seven-day-old child he had just lost from Bathsheba's birth, he knew he would go to it again someday. This indicates the baby was secure and in God's presence after death.