How much water?

at this size, you want to lightly mist the topsoil and you want to only do this when the top inch or two of soil is dry, seedlings don't require a lot of water.

Hi bro!! Seedling: "Spray" the seedling lightly with distilled or purified water until it shivers from the weight of the water droplets, then stop. Spray around the perimeter of the seedling until the surface is moistened (do not let the seedling collapse), twice a day. Vegetative - (Fabric pots to avoid drowning the roots). When the plant has about 4-5 internodes: 1 to 1.5 liters of water per 14-liter pot, one day out of two When the plant is above those internodes: from 1.5 to 2.5 liters of water, one day out of two This will cause runoff, which helps prevent root knots and mineral salts from building up near the bottom of the pot. Always empty the saucer after one hour from irrigation. To check if the soil is still wet: Test of the 2 knuckles in the soil, or the pot weight method. Flowering - As for the veg state. Good luck with your grow mate!!💪🙏

For at least 10 days I cover my seedlings to create the perfect environment.Get a 1ltr plastic bottle and cut the bottom off,I leave the lid on for several days then take it off for a few days before removing.Its like its own little propagator.You'll find you own need to give it a drizzle of water once or twice over 10 days.Spraying a few times a day is good practice.You don't get a huge amount of growth shooting out from your side roots in the first couple of weeks but your tap root,the main root shooting straight down could reach the bottom of the pot after 14 days so when you do your first watering make sure it reaches the bottom of the pot.It should still be damp after 14 days so the once over this time should be enough unless its a small pot in hot dry conditions.

I agree with the watering each 2-3, depending on how dry your medium is. But u should keep in mind that seedlings love high humidity because they have a poorly developed root sistem and they absorbe water from the air. I like to spray the top soil with or maybe even put a plastic cup over the seedling, but make sure u put a hole in the cup so u dont get fungus growing. For later in the grow the general rule for how much u should be watering is about 5-10% of the growing medium. Especially in flower ur plant is going to need a lot of water.

In the beginning, i only give a little bit each 2-3 days. Roots needs to search for water so don´t water too often in the beginning. Seedlings are sensitive to too much water. Hope this helps. Peace.