I do not really know when vegetation starts and germination stops. But to me vegetation starts when I see leaves.
I put the baby under roughly 16DLI (200PPFD), 23h/1h. I keep it moist with our tap water which has roughly pH of 7 and EC 350ppm. The soil plug from Royal Queen Seeds has a pH of 5.7 and an EC of 0.8. So in total we should be in the acidic regime and the plant should have more than enough nutrients for the beginning.