We reconsider the Coleman's mechanism that solves the Cosmological Constant
Problem by the baby universes. We use the Lorentzian path integral and allow
each universe has a different effective field theory and a vacuum. By using the
probability distribution of coupling constants, it is shown that the
cosmological constant of our universe does not necessary become small due to
the effects of other universes.Comment: 13 pages, 3 figures; typos are corrected, and references are added
(v3