I think you need to move up to larger prey. You would be surprised how much they can stretch their mouth and throat. You really should go by the girth at the largest point rather than throat size when choosing prey. Generally they can take something as big around as their largest girth, or about 10% of body weight. A weight would be helpful in giving advice, but most 1 year olds should definitely be taking bigger than a small mouse. To give you an idea, my 11 month old is 400g and taking small rats. She really should be on larger weaned rats, but i cannot get them locally. My supplier pulls the smallest of their small rats for me. If I went by what I thought her throat could handle I would still be feeding mice.
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