need help with when to top

so when does it stop being a seedling and become a plant in veg. also when should i,top them . they only have 3 leave still. 3-4 sets and growing strongI will have pics later they are in the dark cycle now. they came out of the dirt jan 8 and 15. thank everyone for there help
 
4 sets of true leaves sounds like a safe minimum for first pinching/topping. The most important thing to wait for is the vigorous growth that usually accompanies the 4th+ set of fan leaves. I hope this helps. Personally, I wait until each plant is strong enough to avoid stunting the growth. The size of the leaves/stem can also be a good indicator. Happy cultivating:leaf:
 
here is what they look like 3 weeks and 4 weeks. they are starting to take off. Visible growth every day. I'm new to trying to top so they are probley to young.
 

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Those are young for my taste, but ive seen some people start their routines when the first full leaves start.
 
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