That is odd, I'm sorry you're dealing with this. :s
If he's not already, I'd move him into a completely sterile little tub (just a white paper towel, 1-2 hides, one water bowl) just in case, to keep a close eye on if anything weird happens.
I'd offer again in 5 days or so, just wait the full 2 weeks minimum after a regurge. You could just be offering too early.
Just in case I'll mention again, but I would make sure you're not offering the pinks too hot. The water should just be barely warm, not warm to hot. I honestly don't know why some people on the forum are recommending new keepers to heat f/t prey in HOT water... It should not be hot lol.
No way that it's weather related especially for such a tiny hatchling who barely ate, and that you're keeping your ambient temps steady... Mine hasn't missed a meal.
I hope your dude eats soon!