The address for PubMed is:

http://www.ncbi.nlm.nih.gov/PubMed/

And here are some quotes from the welcome page:

"Introduction
PubMed is a project developed by the National Center for Biotechnology
Information (NCBI) at the National Library of Medicine (NLM), located at
the National Institutes of Health (NIH). It has been developed in
conjunction with publishers of biomedical literature as a search tool for
accessing literature citations and linking to full-text journals at Web
sites of participating publishers.

"Database Coverage
The PubMed search system provides access to the PubMed database of
bibliographic information, which is drawn primarily from MEDLINE and
PreMEDLINE...It is expected that access to additional National
Library of Medicine databases will be added in the future."

Happy Searching!

Ginna Wall, MN, IBCLC, Lactation Services
Coordinator University of Washington Medical Center, Mailbox 356153
1959 NE Pacific Street, Seattle WA 98195
Voicemail: (206)548-6368, Fax: (206)548-7665