s1/s2 visa

I'll be working in China on end of november. Then I will have a month vacation starting end of july 2017 and im planning to bring my son who is 3 yrs old when I get back to china on end of august 2017. Can I apply for his s1/s2 entry permit while I am on my 1 month vacation? So we can fly together once we get back to china and we will be back to the philippines by december 2017.