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Breast milk

life science Maturity 11-13 Next article →

Breast milk is the primary source of nutrition for newborn infants. It is produced by the mammary glands in the breasts of women. This liquid is much more than just food for a growing baby. It contains a complex mixture of fats, proteins, and carbohydrates. It also includes a varying composition of vitamins and minerals. Beyond nutrition, breast milk provides essential substances to protect infants from infection and inflammation. These include microorganisms, symbiotic bacteria, and immunoglobulin A.

Breastfeeding
Breastfeeding

The production of milk is controlled by specific hormones. After childbirth, the hormones prolactin and oxytocin trigger the body to produce milk. The very first milk produced is called colostrum. Colostrum is a thin, yellowish fluid that is rich in protein and antibodies. It provides passive immunity to the newborn while its own immune system is still developing. Colostrum also acts as a mild laxative to help the baby pass meconium. This process helps prevent the buildup of bilirubin, which can cause jaundice.

Colostrum vs breastmilk
Colostrum vs breastmilk

As time passes, the composition of the milk changes significantly. In the first three to four days, the milk is thin, watery, and tastes sweet. Eventually, it transitions into mature milk, which is thicker and creamier. While some people used to distinguish between "foremilk" and "hindmilk," scientists now know there are not two separate types of milk. Instead, the fat content simply increases gradually as the baby breastfeeds.

Human Breastmilk - Foremilk and Hindmilk
Human Breastmilk - Foremilk and Hindmilk

This means the milk becomes fattier and fattier over the course of a single feeding.

The chemical makeup of human milk is very precise. It consists of 0.8% to 0.9% protein and 4.5% fat. It also contains 7.1% carbohydrates, which are mostly made of lactose. Other minor components include human milk oligosaccharides, which are special sugars. These sugars help develop the infant's gut microbiome, which is the community of microbes in the digestive tract. The milk also contains 0.2% ash, which represents its mineral content.

Breast milk storage containers bottles
Breast milk storage containers bottles

Breast milk offers many long-term health benefits for both the mother and the child. For infants, breastfeeding is linked to a 73% decreased risk of sudden infant death syndrome. It can also decrease the likelihood of middle ear infections, asthma, and eczema. Some proteins, such as alpha-lactalbumin, may even help protect against cancer. In the stomach's acidic environment, this protein can form a complex called HAMLET that kills tumor cells. For mothers, breastfeeding helps the uterus return to its pre-pregnancy size. It can also reduce the risk of breast cancer and certain types of diabetes.

Colostrum vs breastmilk
Colostrum vs breastmilk

Global health organizations provide specific guidance on how much milk an infant needs. The World Health Organization and UNICEF recommend exclusive breastfeeding for the first six months of life. During this time, breast milk is the sole source of nutrition. After six months, safe and nutritious solid foods should be added. This is because an infant's energy requirements begin to exceed what milk alone can provide. Breastfeeding is recommended to continue up to two years of age.

Bottles of Pumped Breast Milk
Bottles of Pumped Breast Milk

There are several ways to provide breast milk to an infant. Most newborns can latch onto the breast within one hour of birth. However, globally, sixty percent of infants are not breastfed within this first hour. If direct breastfeeding is not possible, milk can be expressed using a breast pump. This expressed milk can be given via a bottle, cup, spoon, or even a tube. Using a cup can actually improve breastfeeding outcomes compared to using a bottle. For mothers who cannot produce enough milk, pasteurized donor milk or commercial formula are options.

Bottles of Pumped Breast Milk
Bottles of Pumped Breast Milk
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🖼️ Images & Media (6)
File:Human Breastmilk - Foremilk and Hindmilk.png
Human Breastmilk - Foremilk and Hindmilk.png
File:Bottles of Pumped Breast Milk.jpg
Bottles of Pumped Breast Milk.jpg
File:Breastfeeding.png
Breastfeeding.png
File:Colostrum vs breastmilk.jpg
Colostrum vs breastmilk.jpg
File:Bottle of Pumped Breast Milk.jpg
Bottle of Pumped Breast Milk.jpg
File:Breast milk storage containers bottles.JPG
Breast milk storage containers bottles.JPG
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