Final answer:
The example that is not a form of co-sleeping is option 4) Baby sleeping in a bassinet in a room with his or her sibling, as this is considered room-sharing. Co-sleeping ordinarily means the baby sleeps in close proximity to the parents, which includes options 1, 2, and 3.
Step-by-step explanation:
All of the following are examples of co-sleeping Except number 4) Baby sleeping in a bassinet in a room with his or her sibling. Co-sleeping generally refers to the practice where a child sleeps in close proximity to one or both parents, not necessarily in the same bed. While options 1) Sofa sleeping in the parent's room, 2) Waterbed sharing, and 3) Baby sleeps in a co-sleeper attached to parent’s bed involve the parents and can be categorized under co-sleeping, option 4) is considered room-sharing rather than co-sleeping since the baby is not sleeping in the same room as the parents.
In relation to SIDS prevention, recommendations such as having infants sleep on their backs, using a firm sleep surface without loose bedding, and maintaining a smoke-free environment are vital. It is important to note that co-sleeping on sofas or waterbeds increases the risk for SIDS and should be avoided. Parents should be made aware of these recommendations to help reduce the risk of infant mortality related to SIDS.