Ok, bingo, problem discovered!
Your next steps are perfectly clear
1) get a thermometer for your formula. Here it would be called a “confection thermometer” what you are looking for is a thermometer made to test liquids. Your formula NEEDS to be between 40 and 43.3 degrees Celsius. Any cooler and the formula won’t digest properly and can actually spoil in the digestive tract and poison your baby. Any warmer and you risk dangerous burns. The “breeders” who say you don’t need a thermometer aren’t telling you how many of their babies are dying.
2) Get a thermometer for measuring room temperature and find a means of STABILIZING the temperature in the box (and I would move him to a glass container with bedding if possible, much easier to stabilize the temp). You probably need to keep him at about 36.9 degrees Celsius, but no less than 36.1 degrees and no more than 37.8 degrees. If he is too cool his body cannot function properly and cannot absorb nutrients properly. If he is too warm he can overheat and dehydrate.
3)Once you have the temperatures sorted out he will almost certainly be eager to eat! Add 2 drops of apple cider vinegar to his formula for 5 days.
If you do all of this in time, he will probably pull through, but time is VERY SHORT! You likely have only a few hours, maybe less, before he dies if you can’t get this sorted.
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