Following the “tradition” …

Hello Nico!

children.push({
  name : 'Nico',
  height : 53,
  weight : 3876,
  birthday : moment('2016-12-02')
})

*) This time I am using JavaScript for the snippet, because one of the many things that happened in those last 4 years is, that I have learnt to friggin’ love JavaScript!
Also, I am using Moment.js for the birthday property, because .. well you really should when working with JavaScript and dates.