An user Spanish
says…

Por lo general
  se
Pronoun
  usa
Verb
  en
Adposition
  niños
Noun
  de
Adposition
  cuatro
4
Numeral
  años
Noun
  de
Adposition
  edad
Noun
  o
Coordinating conjunction
  menores
Adjective
.

It is usually used in children four years of age or younger.
Words and sentences
New
en

  1. in, at, on
  2. in (a time)
  3. in (a language)
  4. used after some verbs and translated by various prepositions in English
  5. in (in various expressions)

New
niños

plural of niño Boys or children.

4
New
cuatro

New
años

plural of año

New
de

New
edad

  1. age
  2. time since an event
  3. age (period of time)

New
menores

New
general

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