Hi,
Check the roots. If they already invaded the whole pot, do pot up. Keep potting up as soon as roots completely surround the interior of the pot -
Add fertilizer, expose the plants to full sun. They will take one year to build their root system and have efficient foliage and stems. But then they may grow fast.
3 months is nothing. Since you started with small sticks, expect to catch up with trees in a 3 years schedule. So 3 months ... well... you probably already read me, but as a reminder:
PATIENCE, Patience, patience ...
3 Years ... perhaps 4 to get fruit and that is with good cares. It could never happen if you mess up every now and then (lack of nutrients, lack of water, lack of sun, dog chews the tree, kid breaks the stems ...) ...