Yellow spots are due to a lighting issue, leaves too close. These look very insignificant. So no worries. Don't let them get any larger. Also try spacing them a little bit further away.
As for the gray spots it could be a mineral deficiancy, more than likely magnesium. Try 1 tsp of epsom salt in a gallon of water and apply to plants sparingly.
Could be disease.
Could be cannabis strains. Need some more info on plant...
Thanks man, PurpFreshy
PurpFreshy Reviewed by PurpFreshy on . healthy babies getting grey shoots and a yellow spot, (quality soil) here's my case, pretty simple one, I got 4 plants, im in day 13, now , no over watering, no nuting (soil is rich and high quality so theyre not craving anything), 2 of them are showing some issues, one has greying shoots, the other one has 2 tiny yellow spots, (I assume the region died since the dots are flat)\ so whats the deal?? Rating: 5