As babies, not too many problems arise, unless one falls ill.
Quarentine is always best.
But to get in good with the answering, here goes.
While small, the big issues are health and stress. One may dominate the other and keep it from getting all the food and water it needs, as well as the difficulty in determining an ill one in some cases.
While nearing puberty, if you wind up with two males, they will need to be seperated to prevent combat.
If mixed sexes, you will have to deal with breeding issues, such as eggbinding, whether to incubate or
toss etc as well as extra stress due to the females inability to escape the male during unwanted advances, which can lead to nasty tears and cuts on the female or both, sometimes leading up to and including death.
Since iggs get rather large and require a lot of room, then depending on where you live, you may want to consider either giving them their own half of a room or an outside setup for them.
Oh yeah!
Welcome to Redtail!