It is hard to see but it looks like he may have had trouble absorbing his yolk sack but he should be fine if you keep him in the incubator and give him time to rest and recoup from his hatch. Sugar water and boiled egg aren’t a bad idea but just don’t be surprised if he doesn’t eat much since he’s still being sustained by the yolk. Their appetite doesn’t really start to pick up until about day 3. I can’t definitively say why your hatch results have been poor without a detailed knowledge of where your eggs came from, your incubator, and what you did during incubation but you have all the knowledge to do your own trouble shooting. Check out this article: https://www.backyardchickens.com/a/hatchability-problem-analysis Since your chick is alone, you may want to seriously consider doing one of two things:
- Spend every waking moment with it until it’s old enough to put next to or with your other chickens
- Find it a buddy of a similar age