Where is 星期七？

There was no problem when you told him the days of the week in English but he will be curious when it comes to the Chinese version. It happened one day when mummy read a Chinese story book regrading the days of the week to him. He asked mother where is the 星期七 after day by day from 星期一 to 星期六 . Mother just thought that whether this explanation can work for him or not? So tried my luck by saying that the day of the week only stops at the 星期六 then begin again in 星期日 and repeat the cycle again. Phew, he accepted the explanation if not mummy doesn't know how to explain to him further.