Bottom of stem is yellow, leaves are light green

Hi everyone! I just noticed my 3 weeks old plant has yellow stem (just the bottom) and leaves are turning light green, some yellowish...anyone could you please help?

they look fine to me. if you notice continual yellowing add nitrogen to the feed. most "veg boosters" will have ample nitrogen wth good P to get root development as well. A good root mass = more uptake of nutrients = great flowers and fruits!

Too much water perhaps. How often ya watering?

I didn't water them for like a week now, just yesterday I watered them all...The soil was still little moist...should I let the soil dry up more you think?

Give them some time and see what happens. Ya could let them dry out a little more.