I think it's amazing how babies don't feel something like a piece of hair or dust in their eyes while everybody else's eyes water up until it's removed. Maybe it's because God created them that way since they can't rub their eyes properly on their own yet.
I think it's amazing how babies can survive a very bad smell when everybody else feels the need to barf or run away from one. Maybe it's because God created them that way since they can't pinch their nose nor breath through their mouth yet.
I think it's amazing how babies don't get headaches after crying for a long time while everybody else gets one for different reasons (crying for a while, hunger, lack of sleep, stress, etc...). Maybe it's because God created them that way since that's their only way of communicating their needs for everything.
I think it's amazing how small babies can survive on milk only (like a liquid fast) for months and still gain weight and be able to function properly while everybody else would be low in energy, lose weight, and eventually need more food. Maybe it's because God created them that way since they have no teeth so early and can't feed themselves yet.
I think it's amazing how babies' ears don't hurt due to the air pressure on airplanes (contrary to popular belief) while everybody else's ears would need to be popped to alleviate the pain. Maybe it's because God created them that way since they can't chew gum nor force themselves to yawn. (Warning: This is just MY opinion because I couldn't find any studies made to prove this popular belief. All I found was somebody else's opinion from a blog being quoted by all. God has made everything perfectly because He already knew the future. My guess is that they get startled sometimes due to the sudden noise and movement of the airplane. That's why not all babies cry on an airplane).
I think it's amazing that God spoke EVERYTHING to existence with PERFECTION and He created the human body without any need of a prototype or testing. And that the body can heal itself inside (with correct nutrients) and out. And that the body can detoxify itself through the liver and through excrement, sweat, urine, dead skin, exhale carbon dioxide, etc...
I was even more amazed at how great God is when I watched this documentary a few years back called "God of Wonders": 
"When I consider your heavens, the work of your fingers, the moon and the stars, which you have set in place, what is mankind that you are mindful of them, human beings that you care for them?" - Psalm 8:3-4 NIV
"For you created my inmost being; you knit me together in my mother’s womb. I praise you because I am fearfully and wonderfully made; your works are wonderful, I know that full well. My frame was not hidden from you when I was made in the secret place, when I was woven together in the depths of the earth. Your eyes saw my unformed body; all the days ordained for me were written in your book before one of them came to be." - Psalm 139:13-16 NIV