Cohort 1 (prevention cohort):  Inclusion criteria are:  6-6.9 months of age Singleton The mother must live in the study area from the time of inclusion. The consent of the mother or guardian  Exclusion criteria are :  Congenital malformations that make anthropometric measurements impossible. Mother intends to leave the study area before January 2022.  Cohort 2 (treatment cohort):  Inclusion criteria are :  The child is enrolled in CMAM treatment program. The child is between 6 and 23 months of age at inclusion Child lives in one of the 45 health center catchment areas in the study area  Cohort 3 (relapse cohort):  Inclusion criteria are:  Child has been successfully treated for wasting and MAM and has been discharged from CMAM treatment program for at least three months The child is between 9 and 17 months at time of measurement. The child is singleton. The mother must live in the study area from the time of inclusion. The consent of the mother or guardian  Exclusion criteria are :  Congenital malformations that make anthropometric measurements impossible. Mother intends to leave the study area before January 2022.