Breeding normal animals has a chance for babies to come in litters

There is a new ability for goats to breed in large quantities so I think this should be added to other breeing mobs but slightly different. They should all have a chance of about 3% to breed in litters of up to 3. For villagers they should only be able to have twins but only if the amount of beds in the village allows for it. I think this would be a nice mechanic that would provide the occasional nice surprise to players.