ひとりっこ
Composed of
one person; being alone; being by oneself; being single; being unmarried; by oneself
someone with a liking or characteristic; a true representative of (place)
Used in vocabulary (1 in total)
one-child policy (of the PRC)
Examples (5 in total)
I am an only child.
Are you an only child, too?
Are you an only child?
"Do you have any siblings?" "No, I'm an only child."
Being an only child, he was the sole heir.