Check page 39 of the document.

The second column of tables 19 and 20 are what you are looking for. These tables account for occurrences of C19 any time after the first dose.

Table 19's number count is 1178.

Table 20's number count is 1835.

Together they add up to 3013 total children.

Here is an additional sub-stack article that explains what the FDA and CDC did with the data.

Quoting from the article:

of the 375 Sars-Cov-2 infections in the trial, 365 occurred before the third dose. Only 10 occurred after the third dose.

Yes, you are reading that right. The efficacy figure is based on 3 PERCENT OF ALL THE INFECTIONS IN THE TRIAL. (Which is why the confidence intervals are so large.)

I think what this means is that they threw out 3000 case studies that didn't align with their efficacy goal. They narrowed their criteria in such a way as to guarantee that their data was skewed overwhelmingly towards approval of these vaccines as highly effective.