A little seedling like that doesn’t need much of a huge fan for it to do well. A really light breeze should suffice for the first three weeks. It’ll be able to handle more air movement once it gets out of the seedling stage.
I made that mistake on my first grow and I felt like plant was staying realistic short because I had a fan blowing directly on it with no oscillation. The plant didn’t want to poke it’s head up from the edge of the pot.
Good luck bro 🤙
During the first weeks, no direct fan on the seedlings. Turn the fan upwards or towards a wall.
And for the size: each plant is different, even in exactly the same conditions. Just let it grow, it will catch up... mostly....
you'd see windburn if it was having a large enogh effect to slow the plant down.
is stem thicker? may have put resources into that to combat wind.
don't underestimate a small seedling... defintiely don't give direct wind from a fan, but i don't think it would cause any long-term damage based on that picture if you did. i'd wager more genetics than anythign as to the current size. it looks healthy.