What is the kidney size of a 6 months baby?

Normal Kidney Size

The kidneys of newborns are about 4.5 cm long, almost 2 inches, and weigh just less than an ounce. Kidneys of adults are about 12 cm long, nearly 5 inches, and weigh about 5 ozs. The growth of kidneys correlates more with a child's growth in height rather than age, and the normal length of the kidneys can be estimated using a simple mathematical formula based on your child's height. The kidneys grow rapidly in the first year of life, from 4.5 cm to 6.5 cm, and then gradually into adulthood, only about 0.3 cm, an eighth of an inch, per year on average. From Livestrong.com