I had the same. One of the babies born on July 23 refused to eat for weeks. Sept 7th came. 46 days. He had lost about 10% of his weight along the way (born at 61 down to 55), and he looked haggard. I decided I would try one last normal feeding then do an assist feeding the following week.
Sept 7th evening I put a mouse hopper in his enclosure and he took it. I was very surprised (but happy). He then followed up with a mouse on Wed 10th and Sat 13th.
Now that he's finally done it, he seems to like eating so I'm hoping it continues.