I'm not doing anything special to keep the milk going except letting my daughter nursed as much as and as often as she wants (that includes the night time too). When I ask my now turned 2 year old if a lot of breast milk is coming out then she says "just a little" so I actually would never know even if she had not been having so much for the last 12 months... I think less milk is still ok after the kid turned one in nutrition wise but I assume it's more for her comfort?