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Weaning is the process of gradually introducing a mammal infant to what will be its adult diet and withdrawing the supply of its mother's milk. The process takes place only in mammals, as only mammals produce milk. The infant is considered to be fully weaned once it is no longer fed any breast milk (or bottled substitute). ==Weaning in human infants== How and when to wean a human infant is a subject of much controversy. The American Academy of Pediatrics recommends feeding a baby only breast milk for the first six months of its life. However many mothers find breastfeeding challenging, especially in modern times when many mothers have to return to work relatively soon after the birth of their child. The American Academy of Pediatrics and the World Health Organization recommend waiting until 6 months to introduce baby food.〔 However, many baby food companies market their "stage 1" foods to children between 4 and 6 months old with the precaution that the food is meant to be consumed in addition to breast milk or formula and is just for "practice". These practice foods are generally soft and runny. Examples include mashed fruit and vegetables. Certain foods are recommended to be avoided. The United Kingdom's NHS recommends withholding foods including those "that contain wheat, gluten, nuts, peanuts, peanut products, seeds, liver, eggs, fish, shellfish, cows’ milk and soft or unpasteurised cheese" until a baby is six months old, as they may cause food allergies or make the baby ill.〔("Solids: the first steps" ). Retrieved 2010-06-28.〕 However, recommendations such as these have been called into question by research that suggests early exposure to potential allergens does not increase the likelihood of allergies, and in some cases reduces it. In many cultures around the world, weaning progresses with the introduction of feeding the child food that has been prechewed by the parent along with continued breastfeed, a practice known as premastication. The practice was important in human history in that it naturally gave a child a greatly improved protein source and also that prevents infant iron deficiency. The prechewing of food also gives the baby long-term immunological benefits through factors in the mother's saliva.〔 However, premasticated food from caregivers of lower socioeconomic status in areas of endemic diseases can result in passing the disease to the child.〔Premasticating Food for Weaning African Infants: A Possible Vehicle for Transmission of HIV, Elke R. Maritz, Martin Kidd, Mark F. Cotton Pediatrics Vol. 128 No. 3 September 1, 2011 http://pediatrics.aappublications.org/content/128/3/e579.abstract〕 No matter what age baby food is introduced, it is generally a very messy affair, as young children do not have the coordination to eat "neatly". Coordination for using utensils properly and eating with dexterity takes years to develop. Many babies begin using utensils between 10 and 14 months, but most will not be able to feed themselves well until about 2 or 3 years of age. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「weaning」の詳細全文を読む スポンサード リンク
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