The whole body of the pups was exposed at the time of birth. The development of the various systems was imperfect, and the eyes were closed. There was no hole in the occlusion of the ear, and the toes were linked together and could not move freely. At 3 days of age, long hair began to form, around 6 days old, hairs were formed; 10-day-old toes began to separate; 20-day-old ears had small holes that communicated with the outside world; 22-day-old eyes opened, and nesting activities were performed with the female rabbits. After eating, about 35 days of age can be officially eaten. Because of the hairlessness of the whole body, the newborn rabbits have poorly developed body temperature regulation systems and poor cold resistance, and should be kept warm. The newborn rabbits weigh approximately 50 grams, and during lactation (from birth to about 30 days of age), the growth is very fast. At 1 month of age, the body weight is equivalent to 10 times that of the newborn. This period of growth and development is mainly affected by breast milk, and with female rabbits. Body condition, feed type, and how much is associated with the baby. The growth rate of young rabbits after weaning is mainly affected by genetic factors and environmental factors (feed, management, natural conditions, etc.). Different breeds have different weight gains, and generally have fast growth in early stages and slow growth in later stages. Weight gain is fast before 90 days, and weight gain is relatively slow afterwards. The impact of gender on weight gain was not significant at 8 weeks of age, and was significantly different between 6 and 8 months of age. The growth rate of the male rabbit lags behind the growth rate of the female rabbit, so the adult female rabbit weighs more than the male rabbit. China Agricultural Network Editor