Abstract Childhood Acute Lymphoblastic Leukemia (ALL) is the most common pediatric cancer in the world, but especially in developed countries, it is a malignant disease of the white blood cells with a multifactorial etiology that involves an interaction of environmental, genetic and nutritional factors. It is estimated that more than 60% of the patients diagnosed with ALL are children under 15 years of age, with an incidence at 2-5 years. One of the most important aspects that should be considered in pediatric patients receiving antineoplastic treatment for ALL is to take care of their nutrition, since it is known that various factors such as the disease itself or the treatment, can induce the patient to suffer due to low weight or even malnutrition and consequently, this can make your body more susceptible to decompensation caused by; illness, trauma, or infection. At present we know that cancer centers and hospitals treat that this type of patients have a series of protocols to take care of the nutrition of the cancer patient, this in order to reduce the risk of concomitant infections aggravated by the already serious situation of the disease. On the other hand, it is of interest to know once the patient has concluded the treatment and is in remission in the surveillance stage, how this situation of low weight or malnutrition in pediatric age that we know is a stage of development that could be affected and especially the height of your body. In this study, we compared 39 patients with ALL in the surveillance stage, who during their chemotherapy protocol (120 weeks for girls and 146 weeks for boys) had low weight 39 healthy patients without ALL and without any disease and matched by age and sex. Patients who were underweight during their chemotherapy protocol were found to have a significant reduction in body height when under surveillance compared to healthy child volunteers. The results show that patients with ALL have a higher risk of having short stature after completing treatment: In addition, the multivariate analysis showed that patients with ALL and low weight were associated with short stature, female sex, and low BMI.