Definition of co-sleeper in English:
co-sleeper
noun ˌkəʊˈsliːpəˌkoʊˈslipər
1trademark A cot that attaches to the side of a parent's bed to facilitate feeding and comforting of an infant at night.
I had a co-sleeper next to my bed for the first four months
2A parent or child who engages in co-sleeping.
as new parents, he and his wife were co-sleepers, sharing their bed at night with all three of their children
Definition of co-sleeper in US English:
co-sleeper
nounˌkoʊˈslipərˌkōˈslēpər
1trademark A crib that attaches to the side of a parent's bed to facilitate feeding and comforting of an infant at night.
I had a co-sleeper next to my bed for the first four months
2A parent or child who engages in co-sleeping.
as new parents, he and his wife were co-sleepers, sharing their bed at night with all three of their children