The pictured seedlings have been "growing" for well over a month. These are from the berries of Maine potatoes that I grew last year. They started tiny and they are still tiny. No growth. I assume this is not normal, but maybe someone will tell me that it is. I don't want to put them in the ground until they show some maturity but maybe that's what they need.
The taller seedling pictured is just a pepper plant damaged by cats.