It depends on how "devil" is being used.
If you literally mean that the child is the spawn of Satan himself, it would be "un niño del Diablo". If you mean that the child is acting like a demon or is the child of demons, but not necessarily Satan, "un niño del demonio".
Diablo Blanco
Demonio Blanco (White Demon)
diablillo negro
diablo rojo
ricura
¿Cómo se llama su hijo(a)?
"Youngest child" in Spanish is "niño más menor". It is pronounced "NEEN-yo mahs may-NORE". Please see this site for confirmation of the translation: http://www.answers.com/library/Translations
Sister in law in Spanish is cunada.
How to say "hi" in spanish is Hola. How to say "bye" in spanish is Adios.
Diablos Demonios Demontres
The spanish word Diablo means devil To say "the devil" you can say "el diablo"
how to say,you must know your child's weight or age in spanish.
ricura
Niño (male child), niña (female child), muchacho, muchacha.
primogénito
como un niño
Te sientes como un niño perdido would be the best way to say "You feel like a lost child" in Spanish.
proveedor de cuidado infantil
Yo soy hijo único
fue el unico hijo
Era. When I was a child... = Cuando yo era nino...