When a share of a testator's estate is assigned to a child born after the making of a will, or to a child or the descendant of a child omitted in the will, the share shall be taken first from the estate not disposed of by the will, if there is any. If that is not sufficient, so much as is necessary shall be taken from the devisees or legatees in proportion to the value of the estate they respectively receive under the will. If the obvious intention of the testator, as to some specific devise, legacy, or other provision in the will, would thereby be defeated, the specific devise, legacy, or provision may be exempted from the apportionment and a different apportionment adopted in the discretion of the court. (Added 2009, No. 55, § 5, eff. June 1, 2009; amended 2017, No. 195 (Adj. Sess.), § 3.)