I got a quick question

Yes, they are normal with certain strains/phenos. The plants will start needing weak nutrients when the 3-bladed leaves start growing in. Seedlings are often transplanted at this point from an inert seed-starter medium to nutritious soil, rather than actually fertilizing them.
 
when you have 3 alternating internodes, it's safe to start feeding at 1/4 strength. at 2 weeks, you should be close if not already ready to feed.
 
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