Dee, DD kept getting up for her 5am feed until i weaned her from the breast (7 months, earlier than i'd planned) as waking for a bottle/breakfast at that time apparently wasn't worth it to her. DOes your DS ever have a bottle (of BM or FF?). Maybe you could try offering him that at 5am (DH could do it! YAY!), or a drink of water even, it's likely he'll be happy after a few days to wait and have brekfast at 6.30 or whatever with you...?

Just a thought.