There is always a possibility of giving an infant bad habits. For example sometimes a guardian enjoys the laughter of an infant and thus makes it laugh more and more, because it is amusing. But however much an infant has laughed, so much it must cry afterwards, in order to make a balance. And then there may be another mother who, as soon as an infant has opened its mouth to cry, says, "Quiet, quiet!"; but if an infant then becomes quiet, something in its character is broken. It wants to cry, it must be allowed to cry; there is something in its character that wants to come out.