Babies and the elderly are two groups of people to really challenge our ability to build the grandiose idols of self-fulfillment. They (babies and elderly) wreck our day and wreck our plans for the future. And the beautiful thing is, I think that is part of God's design in his order of birth and death.
Jesus rebuked those who marginalized children, even when they were the closest to him (see Luke 18:15-17). James, the brother of Jesus, and Paul, the apostle went so far as to say the trueness of ones religion depended upon how they treated "widows and orphans" (see James 1:26,27 and 1 Timothy 5:4).
I have come to believe that the image of God is not so much a substance that is in you as much as a something that reflects off of you when you relate to other people. The image that reflects off of many people (including myself) when they relate to the weak and the helpless is their god's of convenience and self-fullness.
The image of God helps me to understand the purpose of people who are not "functional" in the normal workings of our society. Without this meta-narrative (over arching story) to interpret the weak and the helpless, it is easy to see them as "optional" or a "problem to be solved". I do not believe this is how the Lord Jesus would have us receive such people. Not as obstacles, but rather as gifts that provide the substance of our hearts to be reveled for what it is (for good or for ill).
The frightening prospect of this belief is that our hearts to get revealed, the comfort is that they can be changed.
When you see who you are in the image of your relationship to the weak and helpless.. remember to present yourself to God, who is able to transform that broken image into a shining reflection of Jesus.