Leaving the
seedling nearest the center of the pot where it is, move the others to their own pots. Fill the new pots making a depression. Pop the
seedlings out of their current home and into their new ones. Smooth the soil around the
seedling in the original pot.
Do this sooner rather than later so that the roots of the 4
plants don't become a tangled mess that can't be undone. The rule of thumb for moving
seedlings is a stem over 1" long and the
seed leaves are open.
seed leaves appear first, then the first true leaves, at which point the
seed leaves fall off. If the
seed leaves are still attached use them as a handle to move the
seedlings.