The rabbit may have a runt in the second batch, but just as well may not. It depends on many factors including the buck, and how many kits are in the litter. One cannot say that she would or would...
The "runt" is the smallest and/or least active of the litter. It may be weak or sickly, or may just be the slowest-growing of the bunch. Some runts die young while others live long, healthy lives.
you just bottle feed it. and if you can it should probably go into the house or its own little area with a trong heat lamp and you have to bottle feed it.
Yes, there are smaller babies that can be considered runts. They are just a tad smaller at birth. They may not fight enough for a teat at nursing time and thus do not grow as fast as the other...