low birth weight -- keywords and MeSH

("Infant, Low Birth Weight"[mesh] OR "Fetal Growth Retardation"[Mesh] OR "low birth weight" OR "low birth weights" OR SGA OR "small for gestational age" OR Lbw OR “intrauterine growth retardation” OR IUGR OR “small for date” OR "small for dates")

co-sleeping -- keyword

("Sleep environment" OR "sleep environments" OR ((bed OR beds ) AND (share OR shared OR sharing OR shares)) OR bedsharing OR "bed sharing" OR bed-sharing OR "sleeping arrangements" OR co-sleep* OR cosleep* OR co-bed* OR cobed*)

I produce keyword searches primarily for the purpose of searching PREMEDLINE and OLD MEDLINE. In PubMed, applying a Neonate/Infant age group limit to a search will limit that search to MEDLINE and exclude all PREMEDLINE and OLD MEDLINE results. For the co-sleeping concept, there is no good MeSH term so to retrieve MEDLINE results, I might perform the keyword search with a Neonate/Infant age group limit, and then, to retrieve PREMEDLINE/OLD MEDLINE/un-indexed PubMed Central records, I would remove the limits, add an infant/neonate concept in keywords, and add -- NOT MEDLINE[sb] -- at the end of the search statement. My infant/neonate keyword search statement is also available via the blog.