All of the books in this list feature children facing growing problems or difficult situations. Some of them are relatively minor, but all are serious to a child at the time the particular diffculty occurs. Each title has more to the plot and characterization than these brief annotations indicate.
Peter and Mr. Brandon, by Eleanor Schick (Macmillan, 1973). In an emergency, Peter's parents must go see his sick grandma. Peter feels uncomfortable at night in the neighbors' apartment, but spends a nice day with the older neighbor, Mr Brandon. Soft drawings illustrate this story. Ages 3 to 6.
Lollipop Party, by Ruth Sonneborn (Viking, 1967). In another working mother tale, Tomas experiences being alone for the first time for the short while between when his sister goes off to her babysitting job and his mother, who was delayed on the subway, gets home. Ages 4 to 6.
Benjie, by Joan