Data from PubMed and Medline were searched for studies published after Jan 1, 1970. The search strategy included articles with the terms ¡°sudden infant death syndrome,¡± ¡°sudden unexpected death,¡± and ¡°cot death¡± with ¡°bed sharing¡± or ¡°co-sleeping.¡± To further specify the potential risk of bed sharing and SIDS, subgroup analyses were performed.
Eleven studies met inclusion criteria and were included in the final meta-analysis. The combined OR for SIDS in all bed sharing versus non-bed sharing infants was 2.89 (95 % CI, 1.99-4.18). The risk was highest for infants of smoking mothers (OR, 6.27; 95 % CI, 3.94-9.99), and infants <12 weeks old (OR, 10.37; 95 % CI, 4.44-24.21).
Bed sharing is a risk factor for SIDS and is especially enhanced in smoking parents and in very young infants.