Re: worried about my 2 boys
I think that is the right thing to do. With chinese hamsters they tend to be quite well endowed so its easy to see if they are male, from what you have said I think that your suspicions are correct and that Spongebob is actually a girl.
Separate them ASAP and bear in mind that she could already be pregnant, look out for the usual signs - nest making, eating more, more noticeable nipples, as well as a larger tummy. Hopefully she isnt, but just be aware that she could be.
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