I don't think he's referring to literal children -- I think the line "depression and time breed to multiply" is metaphorical, and that he has "more mouths to feed than [he] could ever fit in this song" refers more to the fact that he is unspeakably depressed after a long time.
I don't think he's referring to literal children -- I think the line "depression and time breed to multiply" is metaphorical, and that he has "more mouths to feed than [he] could ever fit in this song" refers more to the fact that he is unspeakably depressed after a long time.