Because we see only the true face without a mask, without falsity, without hatred and hate. A face filled with innate love, which the creator gave us a face does not know how to betray and does not know how to lie innocent face free of impurities and scars of human worn.

Because children have innocence and do not have deception and multiple faces as adults do. So we feel the kind of joy that drives us towards happiness and we express this happiness through smiling

Because they are white inside and innocent and instinct .

thank you dear Yahya Shakhatreh .

thank you dear Shakir Tuleab may be beyond this reason.

Because the smile represents innocence

الاطفال يمتلكون قلوب نقيه وصافية يشعرون المقابل بالمستقبل المشرق عندما يبتسمون

اشعر بالراحة حيال ذلك

Children are the continuation of our lives. Seeing children, we are glad that life goes on.

I agree with all comments.

Because children represent innocence, honesty and spontaneity and provide us with a positive energy for life when we see them

Thanks very much every one

Because we see only the true face without a mask, without falsity, without hatred and hate. A face filled with innate love, which the creator gave us a face does not know how to betray and does not know how to lie innocent face free of impurities and scars of human worn.

Because the smile represents innocence .

Children are very sincere, it brings a feeling of happiness

Since child's smile is god gifted .

Child innocence and spontaneity

Children do not know hatred they see all people are good

Because they have white heart and they are innocent and when we see them we see the future and hope.

Because we see child face innocent and simley and tension free mind.

Because we are sure that it acts automatically, innocence and a pure heart

Do not wear a false mask