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I've always heard that the best breeding weigh was 1,500 grams and larger.
If she isn't 1,500 grams, how many grams was she when she had these 'children'?
An under-weight breeding female isn't a very good thing at all, if you are going to breed, I would suggest waiting until she is proper weight to do so.
Sorry if I'm mistaken, but that part didn't seem to be touched up on, and I just noticed it while reading the thread, so I thought that I would mention it.