You can say "imut" or "lucu", but "imut" is more common to say for a child
٤ يونيو ٢٠١٥
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Cute: Lucu
Little boy: Anak laki-laki
He is: Dia
He is a cute little boy: Dia anak laki-laki yang lucu
Goodluck! :)
١ يونيو ٢٠١٥
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-Dia anak yang lucu ya-
٢١ يناير ٢٠١٦
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As aswin said, "imut" (or imut-imut) is more common to say for a child. You can also say "lucu". But it can mean "funny" depending on the context.
You can also say "manis" which literally translates to "sweet".