Kindergarten が[幼稚園](https://eikaiwa.dmm.com/uknow/questions/32001/)です。
そして 幼稚園の[生徒](https://eikaiwa.dmm.com/uknow/questions/53274/)は kindergarten student または kindergartener です。in kindergarten（幼稚園に通っている）と言うこともできます。
例：
My son is a kindergartener.
私の息子は幼稚園児です。
My son is in kindergarten.
私の息子は幼稚園に通っています。
しかしこの言葉の発音は とても難しいです。
幼稚園児は「キンダァガーデナ」 または「キンダァガーデン ステゥーデント」です。
The terms "pre-schooler" and "kindergartner" are interchangeable terms. "Pre-schooler" is more British English and "Kindergartner" is more American. For example:
-My child is a kindergartner and he is so excited about learning new things everyday.
-Sam is a pre-schooler and he has made new friends at his new pre-school.
pre-schoolerとkindergartnerは入れ替えて使うことが出来ます。pre-schoolerの方がイギリス英語で、kindergartnerはどちらかというとアメリカ英語です。
例文
-My child is a kindergartner and he is so excited about learning new things everyday.
私の子供は幼稚園児で、[毎日](https://eikaiwa.dmm.com/uknow/questions/34286/)新しいことを[学ぶ](https://eikaiwa.dmm.com/uknow/questions/51764/)ことにワクワクしている
-Sam is a pre-schooler and he has made new friends at his new pre-school.
サムは幼稚園児で、新しい幼稚園で新しい友だちが出来た
アメリカでは一般に、5歳頃から通う場所をkindergarten、それ以前に通う場所をpreschoolと呼びます。（場所によって細かい違いがあると思います）
ですので、それぞれにerをつけて、preschooler、kindergartenersと呼びます。
preschool kidsやchildren in kindergartenのように表すことも自然です。
The playground is mainly for preschoolers.（その公園は主に幼稚園児用です）
The kids in kindergarten are supposed to bring their lunch.（幼稚園児はお昼ご飯を持って行くことになっている）
1. In the U.S, children that attend pre-school are called "pre-schoolers". Children that enroll in pre-school are usually under 5 years old. Pre-school is a way to transition young students into an academic and social setting before they enroll in kindergarten. It's a great resource for parents to prepare their child for early education, and is used very often in the United States.
2. Similarly, children that attend kindergarten are called "kindergartners". The age of enrollment is usually around the ages of 5-6 years old.
Children who attend school are often called students. At different levels they are referred to by different names. A preschooler or kindergartener is someone who is attending school at age 3 to 5. An elementary school student is someone who's attending school between the ages of about 5 and 11. A school at this level is also known as a primary school. A middle schooler is someone who attends school from about ages 11 to 13. A school at this level is also known as a secondary school. A person in high school is called a high schooler and they attend school from about ages 14 to 17. A school at this level is known as also known as is secondary school. Finally, tertiary level students are referred to as college students and this can be at any point in their life after high school.
学校に通う子供は、 studentと呼ばれることが多いです。学校が変われば、言い方も変わります。preschooler又はkindergartenerは、学校に通う3歳から5歳までの子供のことです。
elementary school student（小学生）は、学校に通う、大体5歳から11歳までの子供のことです。この段階の学校は、primary schoolとしても知られています。
middle schooler（中学生）は、学校に通う大体11歳から13歳の子供です。この段階の学校は、secondary schoolとしても知られています。
high school（高校）に通う学生はhigh schoolerと呼ばれます。大体14歳から17歳の子供のことです。この段階の学校は、secondary schoolとしても知られています。
最後に、第三期教育の学生（tertiary level student）は、college student（大学生）と表されます。これは高校卒業後、人生でいつでも通うことが出来ます。
"Pre-schooler""
"Kindergartener"
Both terms are popular in the U.S. and used to describe a child that has just begun its school journey. Depending on what part of the U.S. you are in one is more common than the other.
アメリカ合衆国 
南アフリカ 
日本 
