how can children be a beautiful thing in life?

sometime the human mind couldn't to understand some things, like, how can children be a beautiful thing in life with all this hardship?
What's the benefit of caring another young human (child)?
Even though this child takes a lot of comfort and time

The answer from a two-month-old baby with the first smile,
Like he was saying I was born and I only knew crying, but now I learned to smile for you to tell you that I love you and that I am happy with all the care I receive from you,
Then the first laugh comes at the age of five months,
Then the first tooth in seven months that make the sunrise of wonderful smiles
Then the first word mom or dad in eight months,
Then the first kiss without the occasion from a new bud in life

In all these times, children take us without permission at moments of real and sincere happiness,
As we ponder their little achievements and their joy for it, we learn that the simplest stages of life and its details deserve to be celebrated,
And we have a chance to touch deeply meanings while we escort them on their journey to the life.
And we see honesty in their expression of love and of happiness or sadness
And we know the meaning of reassurance at the present moment without worrying about the future
And we feel the meaning of serenity from hatreds and understand the meaning of insistence on learning and progress in life.

.....................................Thank you my son (Moussab) ...... sorry my life