S.C. Code Ann. § 62-2-302 – Pretermitted children

(a) If a testator fails to provide in his will for any of his children born or adopted after the execution of his will, the omitted child, upon compliance with subsection (d), receives a share in the estate equal in value to that which he would have received if the testator had died intestate unless:
1. (1) it appears from the will that the omission was intentional; or
2. (2) when the will was executed the testator had one or more children and devised substantially all his estate to his spouse; or
3. (3) the testator provided for the child by transfer outside the will and the intent that the transfer be in lieu of a testamentary provision is shown by statements of the testator or from the amount of the transfer or other evidence.
(b) If, at the time of execution of the will the testator fails to provide in his will for a living child solely because he believes that child to be dead, the child, upon compliance with subsection (d), receives a share in the estate equal in value to that which he would have received if the testator had died intestate.
(c) In satisfying a share provided by this section, the devises made by the will abate as provided in Section 62-3-902.
(d) The child, and his guardian or conservator acting for him, may claim a share as provided by this section by filing in the court and mailing or delivering to the personal representative, if any, a claim for such share within eight months after the date of death or within six months after the probate of the decedent's will, whichever limitation last expires.