Upon the expiration of 6 months from the date of the entry of the decree of adoption, any irregularities in the proceedings shall be deemed cured, and the validity of such decree shall not thereafter be subject to attack either through collateral or direct proceedings.

Code 1935, § ?3551L; 48 Del. Laws, c. 134, § ?3; 13 Del. C. 1953, § ?918; 68 Del. Laws, c. 259, § ?1; 73 Del. Laws, c. 171, § ?3;