That's difficult to say. Some breeders have their babies eating greens very young, while others don't even bother.
It also depends on the dragon itself. You can talk to lllReptiles and ask them if he/she is eating any greens yet. Otherwise you may still need to break them into it.
It also depends on the dragon itself. You can talk to lllReptiles and ask them if he/she is eating any greens yet. Otherwise you may still need to break them into it.