These babies are 4 weeks today. I think I might have stunted them abit. With coco staying wet for too long( cool temps and high humidity) so repoted with some perlite. I am going to try and follow the vpd chart and hence increase temperature abit. I was only planning on giving a 8 week veg but these might be longer. Still need to main line and repot to 12 lt pot so have 4 weeks to do that will keep you all updated peace out.
They not small at all pal. You can't judge a seedling by size for at least the 1st 14 days have passed then you'll know for sure if they are slow. To me, they look good.
Your RH is little low. I find that if I wet a bath towel and hang it from the top bar at the side of the tent. As it dries it'll bring her RH up 2 70+%.. but as I said. They look on track.
Enjoy the rest of your grow.