It's been a week since my c-section... WHERES MY MILK?

Had a c-section a week ago. I've been drinking lots of fluids, but my milk still isn't in =( I guess it's there a little bit because they are a little bit firm before he eats, but not anywhere like they should be. This is my second baby, both via c-section. With my first, on day 5, BAM my were huge and firm and full, but now there no where like that. Why is my milk not coming in? And what can I do to make it come in? I'm feeding on demand, but my baby is never satisfied because he's not getting hardly anything from me =(.