Painting with a new born

Hannah
Hi all! My baby is one month old and my husband and I are considering painting our room(which is where the baby sleeps) we will. Only being painting half the wall. What I need to know is how long I have to keep her out of the room. And maybe some tips on getting the smell out quickly?? I was thinking of leaving the window open with a box fan to pull out the fumes and maybe even getting a air purifier to help clear it quickly?? Otherwise me and baby will be sleeping in the livingroom. Any advise? Tips?