Why does Namikaze Minato's last sentence in The Lost Tower sound silent?

Either the son: Musko or Naruto: I think it is more likely to say' son'. Before Namikaze Minato said this, he said in Naruto,' If I have a son, I will train him to be a ninja like you'. Watergate told Jiraiya that he named his son Naruto (the same name as the protagonist in Jiraiya's novel). 2. After the hidden sound, Naruto got up one second late. Picture:

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3. According to the character expression A. The expression that Naruto expected when he asked Namikaze Minato.

B. Namikaze Minato's gentle expression when he speaks.

C. Naruto looked a little sad when he heard that word.

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I don't think AB needs to deliberately hide the name of the protagonist, so it is more likely to be a' son'.