Nothing to worry about.

- the baby ones will continue to grow.

- the fully grown ones differ often, some are bigger some smaller, depending on different factors (light etc)

- repot? depends, take a pic of the soil? condition? rootbound? etc

- its 2 different plants

p.s. the plant looks great btw

Plants in the mulberry family, which includes ficus, are genetically programmed such that each successive leaf on any given branch or stem will be larger than the leaf that emerged immediately before it. In a 2-trunk planting of the same species, it's not at all unusual for leaves on stem A to be larger or smaller than those on stem B. This can occur even if the 2 stems are connected at or below the soil line; this, because roots that primarily feed stem A might be better developed. If the stems are connected at/below the soil line, the difference in growth rates or leaf size usually becomes less noticeable as time goes on.

If you live in the northern hemisphere, now through the first or second week of July is the best time to repot. You can tell if your plant needs repotting by lifting it from the pot and examining roots. If the root/soil mass comes out intact, or some soil falls away to reveal a solid root mass in the middle, your plant needs repotting. It's a very rare plant that comes from the point-of-sale outlet not needing a full repot. The 2 reasons to repot are, root congestion and/or a poor soil.

Al

Al Tapla would you be able to tell me what is wrong with mine? I've had this tree four four years and never had any trouble with it but now I am killing it! I wanted it to grow more branches so I pruned it and moved it to a sunny-er spot and added grow lights and started fertilizing more regularly. Next thing I know, it's getting yellow blotches all over the leaves and sometimes red speckles and tiny pin holes. I found spider mites on a different plant, but I couldn't see any on this one, but I hosed it off and sprayed with dish soap in case it was mites. Then the soil was soaked and wouldn't dry and a week and a half later this leaf turned black and dry in the center. I thought maybe it was because the soil was wet too long. I freaked out, so just yesterday I did a full repot (never done this before) and added perlite and orchid bark mix to potting mix to get a grittier faster drying mix. I also cut off half of the leaves. It really doesn't look too happy today (droopy leaves and soft stems and even more red speckling on new leaves) I don't know if it's been given too much light, too much fertilizer, too much water, or is infected with mites, or all of the above. Anything you can suggest? The tiny pin-holes make me think mites are one the table but I hate to stress it out more if it's not that.