It looks a little yellowish but dont freak out. Slower growing plants can mean a number of things, in this stage you can rule out nute issue, the only nute issue that yellows plants like that is a Nitrogen defficiency,which in this stage of the plants growth isnt very possible because the two little round leaves that come out first supply the plant with Nitrogen until its gets is fan leaves out there to really start the photosynthesis cycle.
What you want to think about is SDGF a different strain than the others, maybe it doesnt grow as fast.
Also one thing that burns my bum to this day but is taken as fact (although there isnt cold hard proof) that male plants will grow faster and bigger than the ladies even in the same grow sith same conditions.
This dissappoints alot of growers who have these giants and then realize that only one of em is female, but out of all the runts in the grow most go female.
However like i said this isnt proven science just opinion and probably not true, but it sures seems to be so I go by it. Dont freak out yet as they are still too young to need any true feeding maybe, when your plant food gets there start off with like a 1/4 of what the bottles ask for.
Also make sure your PH levels of your feed water and soil are on. You have fresh soil so it should be okay. Make sure your water (once nutes are added) is PH 6.5-7.
Otherwise the plant cant use it and it will sit in the soil and build up and eventually kill the plant since it cant use it or burn the plants.
They look great though. Just keep an eye on em and dont act before you are sure what you are doing is best.
I currently have 5 bagseed babies under (now 4) 23W CFLs. This is what Im seeing in one week.
2 of them are bushy short about an inch, working on the third node, awesome little stars.
2 of them are runts. Only just now starring out with their second nodes, maybe 1/2" high.
1 of them is just as tall and wide as the first two but this one's second node is big and bushy but only put out one leaf, instead of 3 like usual. The next nodes coming out look slightly off but nothing drastic, this one also likes to branch out a little more sideways, even though it has the same distance from the light.
Only reason I post this info is to show you that they may not always come out of the womb looking identical, but that doesnt mean anything is wrong with them.
The plants will scream HELP b4 giving in. Hell people can break stalks and bend plants all to hell and the only things it does in return as long as its still getting what it needs is continue to do what it should.