How are they looking?

Some plants are slower than others, but it's difficult to tell if it's the genetics or if you did something slightly different to cause it to stall a bit. What I would advise is that if you need to put a stake in to support the seedling, put it as far away from the stem as you can. All the roots radiate from the tap root and sticking a thickish stick like that right down the stem, you have damaged any roots on that side of the plant and only given it a harder time.