In instantiating the ImmutableString, the function pointers to the get and length methods actually refer to the String.get and String.length method, by going through the base variable which is an internally stored String object. The use of a function pointer can achieve inheritance of a method from a superclass.
Most women will start to show at some point between weeks 12 and 24 of pregnancy, with most reporting that they began to show during the first half of their second trimester, between 12 and 18 weeks.
If you are pregnant for the first time, you will most likely start to show a baby bump as early as between the 12th and the 16th week of pregnancy. If you have been through earlier pregnancies, you may start to show earlier than the first time moms.