Everything has an epistemological opposite, but it doesn't always exist objectively. For example, the opposite of dog, epistemologically speaking, is not-dog. This doesn't mean a creature actually exists that is not a dog AND is the opposite of a dog. Most living things don't have opposites.
A breastfed baby should gain between four and seven ounces every week during the first month of life. The first six months of life the baby should gain one to two pounds per month. Then, from six months to one year the average growth rate is one pound per month.
Normal Baby Weight Gain for 0-12 Months Olds. Parents read a lot about the specifics and details of normal growth in this age group. A full term infant must have an average weight at birth of 3.3 kg or 7 lb 4 oz.