My 2nd baby had low oxygen at birth, do not know the cause. i am xpcting my 3rd baby. how can it be avoided. what are the safe methods of giving brth?

Due to medications?: If you were given an epidural or other medications to reduce pain during labor that can sedate your baby and cause it to have low oxygen. I'm a firm believer in natural childbirth whenever possible. There are many techniques like LaMaze breathing you can use to manage pain during labor. See https://www.mamanatural.com/natural-childbirth/ and please read Ina May's Guide to Childbirth, a great book!