How does a baby's respiration and circulation change when the baby is born?

The baby's respiration and circulation change when the baby is born in the sense that it no longer relies/depends on the mother for oxygen.  

Explanation:

Y.w

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

1. what is the relationship between the shape of an enzyme and the reactions they catalyze?

2. how does an enzyme inhibitor work?

separate your answers so i dont get confused : )