Breastmilk immunity
Quote:
Originally Posted by bczmama 
I believe other posts on this board have quoted studies that show that immunity from breastfeeding substantially reduces 6 months (not a year) following birth.
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The immune components in breastmilk do not decrease after 6 months, or even a year. They actually increase as baby gets older.
http://www.kellymom.com/nutrition/mi...nefactors.html
From the above link:
"Some of the immune factors in breastmilk have been shown to increase in concentration as the baby gets older and nurses less, so older babies still receive lots of immune factors. So as a baby starts to nurse less (weaning) and milk supply decreases, the concentration of immunities increases. This isn't age-dependent, but depends on the amount of milk that baby is removing from the breast"
In terms of immunity to illnesses that the mother has had, or has been vaccinated against, being conferred to baby via breastmilk, there isn't enough of the immunities passed on through breastmilk to offer real protection, however it is helpful, and all of the other immune factors in breastmilk are an important part of the baby's immune system.
http://www.kellymom.com/health/meds/...rotection.html
The info below is from the above link and has a good explanation:
"Many moms wonder whether their babies will be protected from any illness that mom has been immunized against as long as breastfeeding continues. Breastfeeding will enhance baby's response to immunizations that he receives, however, breastfeeding will not act as a substitute for immunization.
The immunities that our bodies generate when we get an illness or receive a vaccination are IgG immunities. IgG is the major immunoglobulin circulating in the blood and is the type of antibody that provides long-term resistance to illnesses - the IgG antibodies 'recognize' germs that we've been exposed to previously so that they can be destroyed more quickly.
IgG protection from mom primarily comes to her baby via the placenta prior to birth --this maternal IgG in baby's system gradually disappears by 6-8 months postpartum. A child's own IgG synthesis gradually increases until it reaches adult levels by 7-8 years of age [ref: Behrman: Nelson Textbook of Pediatrics, 16th ed., Copyright © 2000 W. B. Saunders Company. p. 595]. The child continues to get some IgG protection from breastmilk for as long as nursing continues, but IgG does not enter the breastmilk in quantities high enough to "vaccinate" baby (though it's certainly helpful).
Immunities that babies receive from nursing are primarily IgA (IgG and other immunoglobulins are present in much lower quantities). IgA concentrates in body fluids such as tears, saliva, and the secretions of the respiratory and gastrointestinal tracts and has an important protective function.
The many immune components in breastmilk can make a huge difference when it comes to keeping baby healthy. Even though baby does not receive enough of mom's IgG immunities via breastmilk to qualify as an immunization against a particular illness, there are many other immunities (IgA, certain fatty acids, etc) in the breastmilk that are active against the same illnesses."
The only type of immunity that decreases substantially after about 6-8 months is the passive immunity passed from mom to baby in utero.
