3 years old 4 months baby height and weight standards for male and female babies are different, male baby height 86.3-109.4cm, weight in 10.61-20.64kg; female baby height 85.4-108.1cm, weight in 10.23-20.10kg or so. In general, the height standard of 3 years and 4 months old male baby is about 86.3-109.4cm and weight is 10.61-20.64kg; female baby’s height is 85.4-108.1cm and weight is 10.23-20.10kg. The height and weight are directly related to the genetic factors of the parents, and indirectly related to the diet and nutrition in the later period, so there is a big difference between individuals, and there is no absolute fixed value, and the standard can be used as a reference. If the height and weight are slightly higher or lower than the standard, and there is no abnormality in diet, sleep and spirit, it can be regarded as normal. However, if the height and weight of a 3-year-old 4-month-old baby is significantly different from that of children of the same age, it is recommended that he or she consult a doctor in time to exclude disease factors, and if necessary, actively treat and deal with them.