Repotting

Hello,
I have searched the internet far and wide in search of an answer but to no prevail. My question is when should I repot my bonsai sprouts? I know this has been asked many times but I currently have three Pinus Aristata in a bamboo fiber pot and I am worried about their roots intertwining. I have called a couple local “professionals” but have yet to receive a clear answer. Thanks in advance for any help (:

This question is nothing to do with bonsai. The seedling in the picture have hardly germinated, it will be some weeks before you are able to pot them up. The usual advice for seedlings is to prick them out once they are big enough to handle

TattedBison wrote: I have searched the internet far and wide in search of an answer but to no prevail. My question is when should I repot my bonsai sprouts?

There's no such thing as bonsai seed, bonsai sprouts, bonsai seedlings or bonsai saplings. They're just seed, sprouts, seedlings and saplings.

First of all: you're not growing a bonsai, you're growing a tree. That tree you are growing to become suitable for bonsai, but still first thing you are doing is growing a tree. Guidelines for growing trees can be easily found.