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The importance of infant and young child feeding and recommended practices

1.1. Growth, health and development

Adequate nutrition during infancy and early childhood is essential to ensure the growth, health, and development of children to their full potential. Poor nutrition increases the risk of illness, and is responsible, directly or indirectly, for one third of the estimated 9.5 million deaths that occurred in 2006 in children less than 5 years of age (,) (Figure 1). Inappropriate nutrition can also lead to childhood obesity which is an increasing public health problem in many countries.

FIGURE 1. Major causes of death in neonates and children under five in the world, 2004.


Major causes of death in neonates and children under five in the world, 2004. Sources: World Health organization. The global burden of disease: 2004 update. Geneva, World Health organization, 2008; Black R et al. Maternal and child undernutrition: global (more…)

Early nutritional deficits are also linked to long-term impairment in growth and health. Malnutrition during the first 2 years of life causes stunting, leading to the adult being several centimetres shorter than his or her potential height (). There is evidence that adults who were malnourished in early childhood have impaired intellectual performance (). They may also have reduced capacity for physical work (,). If women were malnourished as children, their reproductive capacity is affected, their infants may have lower birth weight, and they have more complicated deliveries (). When many children in a population are malnourished, it has implications for national development. The overall functional consequences of malnutrition are thus immense.

The first two years of life provide a critical window of opportunity for ensuring children’s appropriate growth and development through optimal feeding (). Based on evidence of the effectiveness of interventions, achievement of universal coverage of optimal breastfeeding could prevent 13% of deaths occurring in children less than 5 years of age globally, while appropriate complementary feeding practices would result in an additional 6% reduction in under-five mortality ().

1.2. The Global Strategy for infant and young child feeding

In 2002, the World Health Organization and UNICEF adopted the Global Strategy for infant and young child feeding(). The strategy was developed to revitalise world attention to the impact that feeding practices have on the nutritional status, growth and development, health, and survival of infants and young children (see also Session 9). This Model Chapter summarizes essential knowledge that every health professional should have in order to carry out the crucial role of protecting, promoting and supporting appropriate infant and young child feeding in accordance with the principles of the Global Strategy.

1.3. Recommended infant and young child feeding practices

WHO and UNICEF’s global recommendations for optimal infant feeding as set out in the Global Strategy are:

  • exclusive breastfeeding for 6 months (180 days) ();
  • nutritionally adequate and safe complementary feeding starting from the age of 6 months with continued breastfeeding up to 2 years of age or beyond.

Exclusive breastfeeding means that an infant receives only breast milk from his or her mother or a wet nurse, or expressed breast milk, and no other liquids or solids, not even water, with the exception of oral rehydration solution, drops or syrups consisting of vitamins, minerals supplements or medicines ().

Complementary feeding is defined as the process starting when breast milk is no longer sufficient to meet the nutritional requirements of infants, and therefore other foods and liquids are needed, along with breast milk. The target range for complementary feeding is generally taken to be 6 to 23 months of age, even though breastfeeding may continue beyond two years ().

These recommendations may be adapted according to the needs of infants and young children in exceptionally difficult circumstances, such as pre-term or low-birth-weight infants, severely malnourished children, and in emergency situations (see Session 6). Specific recommendations apply to infants born to HIV-infected mothers.

1.4. Current status of infant and young child feeding globally

Poor breastfeeding and complementary feeding practices are widespread. Worldwide, it is estimated that only 34.8% of infants are exclusively breastfed for the first 6 months of life, the majority receiving some other food or fluid in the early months (). Complementary foods are often introduced too early or too late and are often nutritionally inadequate and unsafe.

Data from 64 countries covering 69% of births in the developing world suggest that there have been improvements in this situation. Between 1996 and 2006 the rate of exclusive breastfeeding for the first 6 months of life increased from 33% to 37%. Significant increases were made in sub-Saharan Africa, where rates increased from 22% to 30%; and Europe, with rates increasing from 10% to 19% (Figure 2). In Latin America and the Caribbean, excluding Brazil and Mexico, the percentage of infants exclusively breastfed increased from 30% in around 1996 to 45% in around 2006 ().

FIGURE 2. Trends in exclusive breastfeeding rates (1996–2006).


Trends in exclusive breastfeeding rates (1996–2006). Source: UNICEF. Progress for children: a world fit for children. Statistical Review, Number 6. new York, UNICEF, 2007.

1.5. Evidence for recommended feeding practices


Breastfeeding confers short-term and long-term benefits on both child and mother (), including helping to protect children against a variety of acute and chronic disorders. The long-term disadvantages of not breastfeeding are increasingly recognized as important (,).

Reviews of studies from developing countries show that infants who are not breastfed are 6 () to 10 times () more likely to die in the first months of life than infants who are breastfed. Diarrhoea () and pneumonia () are more common and more severe in children who are artificially fed, and are responsible for many of these deaths. Diarrhoeal illness is also more common in artificially-fed infants even in situations with adequate hygiene, as in Belarus () and Scotland (). Other acute infections, including otitis media (), Haemophilus influenzae meningitis (), and urinary tract infection (), are less common and less severe in breastfed infants.

Artificially-fed children have an increased risk of long-term diseases with an immunological basis, including asthma and other atopic conditions (,), type 1 diabetes (), celiac disease (), ulcerative colitis and Crohn disease (). Artificial feeding is also associated with a greater risk of childhood leukaemia ().

Several studies suggest that obesity in later childhood and adolescence is less common among breastfed children, and that there is a dose response effect, with a longer duration of breastfeeding associated with a lower risk (,). The effect may be less clear in populations where some children are undernourished (). A growing body of evidence links artificial feeding with risks to cardiovascular health, including increased blood pressure (), altered blood cholesterol levels () and atherosclerosis in later adulthood ().

Regarding intelligence, a meta-analysis of 20 studies () showed scores of cognitive function on average 3.2 points higher among children who were breastfed compared with those who were formula fed. The difference was greater (by 5.18 points) among those children who were born with low birth weight. Increased duration of breastfeeding has been associated with greater intelligence in late childhood () and adulthood (), which may affect the individual’s ability to contribute to society.

For the mother, breastfeeding also has both short- and long-term benefits. The risk of postpartum haemorrhage may be reduced by breastfeeding immediately after delivery (), and there is increasing evidence that the risk of breast () and ovarian () cancer is less among women who breastfed.

Exclusive breastfeeding for 6 months

The advantages of exclusive breastfeeding compared to partial breastfeeding were recognised in 1984, when a review of available studies found that the risk of death from diarrhoea of partially breastfed infants 0–6 months of age was 8.6 times the risk for exclusively breastfed children. For those who received no breast milk the risk was 25 times that of those who were exclusively breastfed (). A study in Brazil in 1987 found that compared with exclusive breastfeeding, partial breastfeeding was associated with 4.2 times the risk of death, while no breastfeeding had 14.2 times the risk (). More recently, a study in Dhaka, Bangladesh found that deaths from diarrhoea and pneumonia could be reduced by one third if infants were exclusively instead of partially breastfed for the first 4 months of life (). Exclusive breastfeeding for 6 months has been found to reduce the risk of diarrhoea () and respiratory illness () compared with exclusive breastfeeding for 3 and 4 months respectively.

If the breastfeeding technique is satisfactory, exclusive breastfeeding for the first 6 months of life meets the energy and nutrient needs of the vast majority of infants (). No other foods or fluids are necessary. Several studies have shown that healthy infants do not need additional water during the first 6 months if they are exclusively breastfed, even in a hot climate. Breast milk itself is 88% water, and is enough to satisfy a baby’s thirst (). Extra fluids displace breast milk, and do not increase overall intake (). However, water and teas are commonly given to infants, often starting in the first week of life. This practice has been associated with a two-fold increased risk of diarrhoea ().

For the mother, exclusive breastfeeding can delay the return of fertility (), and accelerate recovery of pre-pregnancy weight (). Mothers who breastfeed exclusively and frequently have less than a 2% risk of becoming pregnant in the first 6 months postpartum, provided that they still have amenorrhoea (see Session 8.4.1).

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Geneva: World Health Organization; 2009. Bookshelf ID: NBK148967


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