Hello and welcome to the forum!
The baby plants are called a keiki, which in Hawaiian actually means baby. It would help to know what kind of orchid you are talking about. I imagine it is either a Phalaenopsis or a Dendrobium. Verify this before taking any actions.
Once the roots on the keiki reach 2-3 inches long you can gently "pop" it off of the mother plant and put it in its own pot.
Also, if you could go to your profile and fill in your location it may help in the future. We are from all over the world with very different growing conditions. Knowing where you are and what you are working with might help if you have any other questions in the future.
Thanks, and glad to have you here.
