Girls, can you open a window for example for micro ventilation where t…

Girls, can you open a window for example for micro ventilation where the newborn is located? The temperature in the room is 26.5 degrees Celsius during the day 27 degrees. I do this, we go out of the room into the hall, ventilate the room for 30 minutes, and after 5 minutes we go to eat, but it gets hot quickly. It's just a small room 5 square meters. There is a bed 1.4, and a children's crib, we sleep with the baby together.