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.
As far as I understand it, when time outs become appropriate depends on what you are looking for from the time out. While you can give a child as young as 12 months a time out, at that age the time out serves more to give your child a moment to calm down rather than as a consequence for bad behavior. A time out for the under-2 year old is designed to provide a calming moment.