I have a rather large java fern that has several babies growing from it. The largest of the babies has about 4 little leaves and you can see a new rhizome forming. When should I remove the baby from the mother?
If you keep the babies of the mother plant, the mother plant will probably grow better, but most little ferns don't do well unless they are a bit grown.
It won't harm the mother plant since the babies grow their own roots and everything. So they would get most nutrients from their own roots instead of relying off the mother plant.