I've never given little babies any nutes at all, in all my 15 years of growing (15 years outdoor/2.5 indoor) and I've never had an issue with deficiency early enough to warrant adding nutes but also, I'm not using RO water and my city water supply has a decent amount of solids in it already so that could be why my results differ from yours.I give nutes from the beginning.
Yeah they have them stored in the starting leaves, but as long as its a low dose, like 1/16th bottle recommendation you won't notice any ill effects. Why wait until you see the plant losing nutrients? Just keep em there for when they need em.