Question

Why is it that some rabbits only give birth to one offspring at a time?

Answer 1

or the parents ate them. that is a possibility too

Answer 2

Larger rabbits will typically have more babies. Also, as a rabbit gets older towards the end of producing baby rabbits she will produce fewer babies. Cottontails will normally produce 6-8 babies from what I've seen. The rest had either probably left the nest or were eaten by predators such as cats.

Answer 3

Stop looking in rabbit holes. The babies need to be left alone.

Answer 4

Generally smaller breeds have smaller numbers of kits. Like a netherland dwarf may only have a few babies where as some larger breeds will have 10+ babies.. . If your only finding one baby wild rabbit the others were probably eaten by predators( or wandered off) because generally cottontails do not have just one baby( but it is possible)