A literature search for relevant studies was performed in MEDLINE (reference period: 1950
August, 2015), the Cochrane Central Register of Controlled Trials (CENTRAL, The
Cochrane Library, Issue 7, 2015), EMBASE (1974 to August 2015) and CINAHL (1982 to
August 2015) was performed. The key words used were: “low birth weight” and “premature” or
preterm” and “plastic barrier” or “plastic wrap” or “polyethylene” or “plastic bag”, with
restrictions of children and clinical trials. The reference lists in the retrieved publications were
manually searched to identify additional relevant studies. Two reviewers independently