"Suffer little children,  and forbid them not, to come unto Me: for of such is the kingdom of heaven."

Children who grow up as God intends -  in a home full of the love of a father and a mother - grow up free from worry. They don't worry about their next meal. They give no thought to what they will wear. They don't concern themselves with whether or not they'll have a safe place to lay their head -  or a warm bed to lie down in. Why? Because from the moment they were born, and every moment since - they've known love -  a parent's love. Love has cared deeply for them. Love has met each and every need -  so why do we as adults, ever worry or fret? Or fear? My God shall supply all your needs! Take no thought for your life, what you shall eat, or what you shall drink; nor yet for your body, what you will put on. For your heavenly  Father knows that you have need of all these things." 

This is why God demands that we love and care for widows and orphans. So the orphans will know  (just after being born) who their real father is - and the widows will know (just before they die) who their husband is. God's love leaves no one unloved.