Ok I want to know what can a lack of oxygen do to an 5 month old infant. My nephew was rushed to the ER tonight because he was discovered not breathing. I don't know exactly how long it was before he was found that he wasn't breathing. Now the options is surgery with the risk of him having brain damage or him not being here at all. They mention fluid being on hid brain. Now my question is can a lack of oxygen cause fluid on the brain.