Hammocked Banana

First of all, assuming your nanner is inside, give it as much sun as possible always! In my experience, through glass windows it is not possible to get too much sun (unless its a very small tissue culture plant). People in other threads have told you that basjoos are fairly forgiving indoors, however I have most certainly found the opposite to be true. Due to the long "floppy" (bad term, just generally unstrong) petioles of the basjoos, they leaves can get very droopy and weak under the reduced light environment indoors..

Now with this being said, it is natural for some of the bottom leaves to die off the plant as more grow. This I find is actually fairly common indoors due to the very low humidity we have indoors during the winter. U will notice the edges drying first, then the rest of the leaf. Your nanner seems be doing better now, but w/o pics its hard to tell. Bananas really enjoy a lot of root space bc they can transpire a tremendous amount of water when they are actively growing, and so need a lot of root mass to absorb all this water. Dont let this fact confuse u with the fact that bananas dont like the soil to always be wet. In fact your banana will be especially susceptible to rot right now since you recently transplanted to a larger pot and it has yet to fill all this soil with roots. Because of this reason I also highly recommend not to cut any (green) leaves off as the plant needs them to pull water from the soil. I my opinion I would not recommend removing leaves when transplanting, with the exception of a newly removed pup, which does not have any roots yet to uptake water (since the leaves will die regardless, and you dont want to dehydrate the corm at all).

Edit: I just saw your pics. They are just small plants but the new leaves look healthy. They should grow well for u now in their big pots. Just give them lots of sun light and be very careful not to overstate. The the soil dry right out before water each time.