一道SAT数学题,at a certain hospital,89 children were born in the

一道SAT数学题,
at a certain hospital,89 children were born in the month of June.If more children were born on the fifteenth of June than on any other day in June.What is the least number of children that could have been born on the fifteenth of June.
我的答案是45,标准答案说是4,是我理解错了还是答案错了?
题目中有说明每天都有孩子出生吗？