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.
Your child probably won't have a hard time in preschool if you wait till age 4, but you can also look at it this way: First, most kids start some preschool by age 3, and will spend 2 yrs with essentially the same group of peers, which is good bonding. Plus, it's enjoyable for her.