Children come to kindergarten from a wide variety of experiences, so expecting them all to know and be able to do the same things is unrealistic.
My 9-month-old is resisting solid foods, and mealtimes are turning into a power struggle. We introduced solids at six months, and she has been breast-fed, with an occasional bottle of breast milk.
When he is frustrated, our 25-month-old boy hits himself or bangs his head. His mother and I don’t know whether this behavior is normal.