Is a parent's right to discipline their child reasonable?

Defendant's "parental right" argument is meritless. The right to discipline one's child includes the right to inflict reasonable corporal punishment. (People v. Whitehurst (1992) 9 Cal.App.4th 1045, 1050.) However, such punishment is not justifiable when it is not warranted by the circumstances, i.e., it is not necessary or it is excessive. (Ibid.) " '[B]oth the reasonableness of, and the necessity for, the punishment is to be determined by a jury, under the circumstances of each case.' [Citation.]" (Ibid.)