Nothing but windows.

So my mom came over the other day and she saw our crib. We dont have it in the nursery because its being painted. But the crib was in front of a window. She told me that I needed to move the crib away from the window and that I cant have it there. But the nursery is literally all windows. Each wall has windows on it and the one place that doesnt have windows has our electric box on it. We plan on sealing off most of the windows so they dont open or anything but do the windows make the nursery unsafe? We also plan on having black out curtains over the sealed windows.