Goat kids are the easiest to deal with. We have had them born in 18 degree weather with no problems at all. I actually have found that the summer heat is harder on them then the winter cold. They are also very fun to have around always running and jumping. We of course don't have Nigerian Dwarf though we have larger Nubians, Boer and Kiko goats. I think your dwarf goat babies will be even cuter since they will be that much smaller and I imagine that much easier to deal with since you can fit them in a medium dog kennel. You can't fit my Boers in anything short of a livestock trailer. Be sure to take lots of pictures and video if you have the chance.