Wait till you see the 0.3.0.7 (I'm play testing that and will be published tomorrow). It's much more stable. Added more content and fixed milk issue as well.
You can transfer any big boobed npc to milk farm and assign a daily lactation potion. That will fix your milk production issue.
One thing to note that you must always have lactation potions at stock.
Thanks for your support! I'd really love to hear your comments even if it's critical.