to develop and validate an instrument for the classification of pregnant and postpartum women according to the demand for nursing care. a methodological study conducted in three stages: 1) construction of the instrument based on literature review; 2) content validation using the Delphi technique with 12 experts; and 3) Evaluation of the convergent construct validity through the correlation between the scores of the constructed instrument and the Fugulin instrument. an instrument with ten indicators of specific care for pregnant and postpartum women was developed. A content validity index higher than 0.9 was obtained, requiring only one round of the Delphi technique. The Spearman coefficient was 0.64 between the instruments, indicating a strong correlation. the classification instrument specifically constructed for pregnant and postpartum women showed evidence of content validity and convergent construct validity with a widely used instrument in the national territory.