Q&A: Is there something I can do to boost my milk production?

My baby is nearly five months old, and has been breastfeeding from the start with very little problem. She started sleeping through the night at seven weeks. I feed her around 11 p.m. and she wakes up at 7:30 or 8:00 am. Otherwise she feeds about every three hours, give or take a half hour.

I would like to give her only breastmilk for a few more months if possible. She shows some interest in solids, but it's not excessive. I think she would be satisfied with just my breastmilk for a while longer, except that I don't feel like I'm making enough. I'm fine in the morning, but by late afternoon and early evening, my production is really diminished. If I pump in the morning I have about 120 ml. of milk. At 6 p.m. it's more like 30 ml.

Is there something I can do to boost my afternoon milk production to prolong pure breastfeeding for another month or two? Or is it time to start supplementing with solids? Going to solids isn't a bad thing, I was just hoping to keep life simple a bit longer.