Hello...
I have three apricot trees, very small, actually they are about 5-6 months old, only. We started them indoors, from seed during the winter, now is spring they've been outside in the balcony for a while. THey are in big pots now, and they look ok, until the leaves started to get shrunk and started to curl inwards.. I would like to know, if you guys have any idea of why the trees are not growing, and why are the leaves doing that?? thank you very much!!

Often inward curling leaves are the result of some insect. Have you taken a close look inside the leaves?

Tell us where you are and show us some photos.