Objective: With baby massage and exposure to UV rays can provide enormous benefits on the growth and development of the baby both physically and emotionally so that it will increase weight and prevent the possibility of growth and developmental disorders problems in the baby. Methods: Analytical research type of quasy experimental research was in the form of a non-equivalent control group with 2 groups, namely the treatment and control groups. Respondents were babies aged 0-4 months. The research instruments were UBaMa guides and tools and materials for baby massage and exposure to UV rays. The baby's mother was given an explanation and demonstration of how to massage the baby and give exposure to UV rays using the UBaMa guide. The baby was massaged every day by the baby's mother, once a week in the evaluation of how to massage and give uv light exposure by the midwife and the baby is weighed. After the data was collected, namely during the pretest, posttest 1 and posttest 2 were analyzed with Repeat Measurement (GLM) for each group, and between groups with the T test. Results: 20 study subjects in the treatment group, the age was at most 2 months, which was 40%, and the same sex between men and women was 50% each. Of the 20 subjects in the control group study, the most age was 2 months at 50%, and the most gender was male at 55%. The normality test with the Kolmogorof Smirnov test of the treatment group had a normal data distribution with a value of p=0.635 (p>0.05) and the control group also had a normal data distribution with a value of p=0.977 (p>0.05). After the levene homogeneity test, the results were obtained that the data were homogeneous with a value of p=0.572 (p>0.05). The results of the paired T test concluded that there was a significant difference in the average weight gain between the treatment group before getting treatment (Mean=4217.5) and after getting treatment (Mean=60018), p=0.000. The results of the unpaired T test can be concluded that there was a significant difference in the average increase in body weight between the control group that did not get the treatment (Mean=439.60) and the treatment group given the UBaMa method (Mean=439.6), p=0.000. The results of the General Linear Model test can be concluded that there is a noticeable (significant) difference in average weight gain over time, baby massage and exposure to ultraviolet rays can increase the baby's body weight by 867.9 grams within one month and 1784.3 grams within two months. Conclusion: There was a significant difference in the average increase in body weight between the control group that did not get the treatment and the treatment group given the UBaMa method.