I find that mice hoppers and rats pinks are a bit on the small side.
Mine all start on live rats pups and usually eat within a week or so after first shed.

I have only had to assist feed one animal and that was a last resort. Not sure if you are looking for an okay to assist feed or not, but I would give it another week or two.

If the animal looks and acts like normal I would not worry too much. The yolk will usually sustain them for the first few weeks to a month,


Gavin