The Belgian Blue (BB) cattle breed has been well-known for double muscling. The importation of BB cattle is mainly to increase beef production. A study was done to analyze birth weight and body measurements of newborn crossbred BB calves. Data were collected from Cattle Breeding Centre (Baturaden, Padangmangatas and Sembawa) and Livestock Embryo Centre (Cipelang). The crossbred BB calves were produced by crossing of BB bull and some breed cows (Ongole grade, Friesian Holstein, Simental, Brahman, and Limousine) through artificial insemination. A total of 286 crossbred BB calves from five different crossbreds born in 2018-2019 were used in this study. Data of birth weight (BW), chest girth (CG), body length (BL) and body height (BH) were analyzed using a linear model with genotype, calf sex, and their interaction as sources of variation. Results showed that BW and body measurements were significantly affected by genotypes of the calf (P0.05). The BB X Friesian Holstein (FH) calves had heavier BW and bigger body sizes. The BB x Ongloe Grade (PO) showed lighter BW and smaller body size. The means of BW, BH CG, and BL of crossbred BB calves were 37.18 kg, 71.94 cm, 69.13 cm, and 65.54 cm, respectively. In conclusion, there were differences in birth weight and body size among crossbred Belgian Blue calves affected by genotypes. Crossbreeding Belgian Blue with Friesian Holstein breed cattle resulted in heavier birth weight and bigger body size. This study was preliminary information that can be used as a recommendation in developing Belgian Blue cattle.