Find 4-5 abstracts that interest you and then, as a pp said, go to your nearest university medical library to copy the full articles. I recommend a medical library because they are more likely to subscribe to some of the lower impact journals in which a lot of the articles about observational breastfeeding studies end up.
Or, since you only need 3-5 full papers, find a friendly academic or health care professional with institutional access and ask them to pull the pdfs for you. Not strictly OK, but for a small number of articles most people will do it for a friend/acquaintance.
Much easier: If you don't really care whether or not you review the most groundbreaking, talked about stuff of the last four years, check the relevant open access journals (if you do care, there are more and more high impact ones) and just pick three articles that interest you. E.g.:
International Breastfeeding JournalBMC Pregnancy and ChildbirthBMC Women's Health
You could try nursing and family practice journals, too, as those are some of the main clinical areas that tend to publish on breastfeeding, and also some specific clinical journals, e.g., Diabetes Care (which is open access for most content.)
If you need a high impact journal, remember that some are open access for some content, e.g., BMJ puts the full text of most research articles up; the Canadian Medical Association Journal was open access until very recently (so there is still plenty of open content from the last four years, etc.)
Other journal sources:
Directory of Open Access Journals
