Usually only once.
Once.
3
Once a year.
Female rabbits could conceivably give birth every 30 days for 5 or 6 years, however optimum conditions would have to occur for this to be successful.
Gestation is only 5 months so I will say two times
2 times in a year
250
3
Once.
twice
Normally once.
Once a year.
Small mammals like mice and shrews can give birth many times in a year.
An echidna lays a single egg just once a year.
Two times a year, leading to over 20 piglets a year, 8-12 per litter.
Deer breed one time a year and they only give birth one time a year!
They can give birth to as many as 40 pups per year, and those progeny can start having babies about 8 weeks later each producing up to 10 litters per year.