Lactation describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young. The process can occur with almost all post-pregnancy female mammals, although it predates mammals.In humans the process of feeding milk is also called breastfeeding or nursing.rom the twenty-fourth week of pregnancy (the second and third trimesters), a woman's body produces hormones that stimulate the growth of the milk duct system in the breasts 1  : Progesterone influences the growth in size of alveoli and lobes; high levels of progesterone inhibit lactation before birth.
If you weighed 68 kg on Earth, you would only weigh 25.7 kg on Mercury. Venus is very close to Earth in size and mass. Venusâ mass is roughly 90% of the mass of the Earth. Thus, it is no surprise that someone would weigh a similar amount on Venus.
Earth weighs about 13,170,000,000,000,000,000,000,000 pounds (or 5,974,000,000,000,000,000,000,000 kilograms). Since Earth is too big to be placed on a scale, scientists use mathematics and the laws of gravity to figure out Earth's weight. 1  Javascript must be enabled to use Cool Cosmos.