I can only answer this question as I don't deal with the SLH or LH breeds sorry. The "runt" (and I loathe that word) of the litter can be any of the babies born. i.e. a 5th baby born out of 8 might be the smallest, or the 2nd baby born of 3 might be the smallest. In a litter of 6, you will find the weights may vary dramatically. We have had litters of 5 and 6 and there there is a 200 gram span between the smallest and largest baby.