I've been naming the reindeer pups when they grew - I have day 6 pups, just noticed day 6 is not on the chart. Makes sense if they're coming in pairs - there are 8 reindeer, 9 with Rudolph. Day 3, 4, 5, 6 - 4 pairs - 8.
Looks identical to the others, so no item added, but here it is:

(There's one in the same group that I'm not sure about, because it was a trade, and grew at a different time than the rest.)