
Hi,
Congratulations on the promising litter!
Re feeding - what I do with mine is, feed twice a day (which I do anyway) with her normal quantities until 5 weeks, then
slightly increase the total quantity but split it into 3 meals till 6 weeks or so, then up the quantity of high quality protein (but not carbohydrate), giving it in 4 meals as there won't be much room inside for a large amount, till she whelps. What you don't want is a fat pregnant bitch. They have far more trouble whelping generally. Keep up her exercise - not rushing madly about, but walks to keep her muscles in trim.
After she's whelped.....in a few days your food bill will soar!!!!
Hope this helps. :)