Incluye referencias bibliográficas
1. Introduction. -- 2. Methodology. -- 3. Construction of the weight velocity standards. -- 4. Construction of the length velocity standards. -- 5. Construction of the head circumference velocity standards. -- 6. Computation of centiles and z-scores for velocities based on weight, length and head circumference. -- 7. Discussion. -- 8. Bibliography. -- Appendix B Model specifications of the WHO child growth velocity standards. -- Appendix C Results from analyses related to regression to the mean.