Our present theories contain a number of quantities, like the size of the electric charge on a particle. The values of these quantities can not be predicted by our theories. Instead, they have to be chosen to agree with observations. However, most scientists believe that there is some underlying unified theory that will predict the values of all these quantities. There may well be such an underlying theory.
Many people think it is the theory of super strings.
This does not contain any numbers whose values can be adjusted. One would therefore expect that this unified theory, should be able to predict all the values of quantities, like the electric charge on a particle, that are left undetermined by our present theories. Even though we have not yet been able to predict any of these quantities from super string theory, many people believe that we will be able to do so, eventually. However, if this picture of baby universes is correct, our ability to predict these quantities will be reduced. This is because we can not observe, how many baby universes exist out there, waiting to join on to our region of the universe.