Ok, so I had two initial rats both a little over a year old. They have been with me since they were itty bitty babies. One of them, Fuzzle, isn't doing to well health wise(Nothing Contagious), and I was worried the other one would be left behind for another year or so by itself. I have this huge cage suitable for about eight rats and I thought why not adopt two more to be there for the other one? I adopted two gorgeous 5 week old babies from an oops litter. I was told by multiple people, who seemed to know what they are doing, that the babies would get along with the adults almost instantly. Boy were they wrong. I did introductions and held the babies while they sniffed it-BAM! Hopper broke Templeton's neck in literally the blink of an eye. I am obviously completely heart broken and so upset I bawled my eyes out. I should have seen this coming and done some more research. So then I had two adult rats, and a five week old baby all by himself. I didn't want to leave poor Ted in there until he was big enough for another try at introductions. So I thought I would adopt two more from another litter of the same age, then take the correct introduction steps. That way Ted had some playmates until he was older. I found an ad online that claimed the babies were almost five weeks and ready to go. I took two of them and realized no way these could be five weeks, they are literally half the size of Ted. Now what? I have two adults, one 5 week old, and two babies half the size of the 5 week old. I made sure the babies pooped, ate, drank, etc. on their own, and they did. So should I introduce the three babies despite their size? If not what about the five week old Ted? Just let him live by himself until he is 12 weeks? Leave them all be until they are older?