Congrats on your new additions. Can I ask though, why you want to breed them? Because I'm going to be honest here - if you can't even afford to buy a second cage for them, then how are you going to afford to care for the parents plus all the babies properly? Breeding can be very expensive. What if there are problems with the pregnancy, or with any of the babies or the mother after delivery, and they require vet care? There are a lot of risks associated with breeding.
Maybe you can find a cheap used cage somewhere? Are you keeping them indoors? If you are keeping them inside, look into building a NIC or "Neat Idea Cube" cage. Look it up to see what I mean. The supplies are very cheap, around $15 or so usually for a box of cubes and you can usually buy them at places like Wal*mart, Target, and Bed Bath & Beyond.
You'll find different estimates for when they become sexually mature because it's just that, an estimate. There is no magical age that when all bunnies turn that age they all become sexually mature. It can depend on the individual bunny, the breed, the size, etc. It's possible that your rabbits, even though they are young, are already able to breed at those ages. If they are not sexually mature already, they will be soon. Small breed rabbits especially can sometimes become sexually mature as early as 12 weeks, or 3 months old.
But I do urge you to reconsider breeding. Are the two rabbits you have even the same breed? There are thousands of homeless rabbits sitting in rescues and shelters waiting for new homes already, without you adding a litter of mixed breed babies to the mix. Plus, if you can't afford to buy them a second cage than you really can't afford to breed.
Rabbits can be awesome pets, why don't you consider saving up to get them fixed, bonding them, and enjoying them as pets?
Good luck. I hope you're able to figure out your caging issue soon.
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