Foetal giant

Another type of abnormal kit is the foetal giant. Due to the stress of a prolonged and difficult delivery of the over sized kit, usually 2 to 3 times normal size, it will have died from asphyxiation. The following kits, if any, will either been born dead or may be delivered alive but are normally scattered by the mother due to stress. 

It has been suggested that over feeding a pregnant doe may be the cause of this. Most breeders keep a pregnant doe on her normal rations increasing only in the last week before she kindles. Pregnancy and kindling in does is not stressful to their bodies, it's the feeding that takes its toll on the doe, at which point she should be fed freely.

An additional area for consideration that I believe may be a cause of a foetal giant is when conditions for kindling aren't exactly right. That is to say lack of light/heat/correct nutrition. 

Consider in nature, what time of year the mating occurs? From Spring time and onwards when the vegetation is growing, perfect for nourishing the pregnant and lactating doe and later her kits. So, perhaps if any of these requirements are missing the does body will have some resorption of the foetuses to give the remaining one (or more) a better chance of survival. As a result more nutrients will be supplied to just one foetus or few, certainly less than initially conceived. Conversely, extreme heat may also cause this condition.