I might just be paranoid, but it seems like one of my almost 3-week old babies is sitting an awful lot. This one grew leaps and bounds in just a couple days, so maybe it's just adjusting to the extra size and weight of itself, I don't know. I've been mixing Durvet V & E in their water this whole time, thinking surely it would provide the extra niacin, and plenty of other good stuff too. Now I'm wondering if it's enough, and if I should switch to regular water and specifically add niacin myself. Any thoughts?