Blood group B individuals have the B antigen on the surface of their RBCs, and blood serum containing IgM antibodies against the A antigen. Therefore, a group B individual can receive blood only from individuals of groups B or O (with B being preferable), and can donate blood to individuals with type B or AB.
Language development usually signals the development of memory and the understanding required to get time out. . Dr. Sears recommends starting time out at 18 months and expects that toddlers will understand it by 2. . For toddlers many developmental experts recommend natural consequences rather than or along with timeouts.
At that age, toddlers are starting to understand cause and effect and time outs will work (with regular and proper use) because of this understanding. They are also starting to gain more self-control and can make choices (for instance, about whether to stay in or leave the time out area) that add to the success of this method.