I just came across a super cute video and thought this may be just the perfect occasion to teach you how to say cute in Mexico:
lindo or guapo - These could both describe an attractive adult, right?
precioso - This seems close; we might say “precious” in English about a small child.
¡qué mono rico es! - This is just confusing. “What a delicious monkey”?
Here is the über cute baby video I was talking about: