FTM with questions????

Nicole • Was pregnant last year, missed it so much got prego again!!! . Social worker for the homeless. I have a infant and 4 dogs 🐶🐶🐶🐶 Second pregnancy a year later 😯
1)How long is breat milk good for?
2)Should I buy a humidifier? he sound congested when he drinks milk
3)Do I need to boil bottles/breast pump suctions/pacifiers? I have been soaking in daily water only 
 
4) is there a baby powder that is safe???