The nurse is caring for a neonate with congenital clubfoot. The child has a cast to correct the defect. Before discharge, what should the nurse tell the parents ？（）
A．"The cast will be removed in 6 weeks. "
B．"A new cast is needed every 1 to 2 weeks. "
C．"A short leg cast is applied when the baby is ready to walk. "
D．"The cast will be removed when the baby begins to crawl. "
