ventilation and make sure its finished 3 weeks before baby arrives so your baby isnt sleeping in a nursery with paint fumes still knocking about...
the woman shouldnt be under any pressure or physical labor during her pregnancy so i recommend that she doesnt do much of the painting but does the same height painting would be fine, just no bending over or reaching heights by standing on a ladder or anything cause she could fall and hurt the baby, dont risk it
Yes just keep the room well ventalated. There is a lo Voc paint that doesnt let off as much harsh fumes