Poor　indoor　air　quality　in　maternity　hospitals　can　spread　respiratory　diseases;　however,　limited　research　exists　on　modifiable　factors　like　occupant　behavior.　This　study　explores　subjective　drivers　of　window-opening　in　maternity　wards,　using　surveys　and　on-site　measurements.　Results　show　71.4%　of　respondents　stay　less　than　14　days,　leading　to　dynamic　and　irregular　window　behavior.　Comfort,　particularly　thermal　comfort,　air　quality,　and　circulation,　is　the　main　driver　for　window　operations.　Especially　at　low　temperatures,　pregnant　women＇s　comfort　plays　a　critical　role,　while　other　factors　increase　in　importance　as　temperatures　rise.　The　results　show　that　environmental　factors　drive　window-opening,　while　indoor　comfort　drives　closing.　Occupants　are　more　tolerant　to　humidity　than　thermal　discomfort,　but　window　adjustments　are　random.　Moreover,　respondents　prioritize　others＇　needs　in　closing　windows,　where　outdoor　noise　often　serves　as　a　key　factor.　The　time　also　had　a　greater　impact　on　both　window　opening　and　closing　decisions,　while　field　measurements　confirm　that　time　influences　window-opening　more　than　closing.　A　Multivariate　Analysis　of　Variance　(MANOVA)　analysis　of　the　questionnaire　data　for　＇comfortable　sensation＇　showed　that　only　＇air　circulation＇　and　＇air　humidity＇　were　correlated　with　comfort,　whilst　＇heat　sensation＇　was　the　least　correlated.　The　possible　reason　is　that　the　questionnaire　was　conducted　in　the　spring,　when　temperatures　were　within　the　comfort　range,　and　therefore,　occupants　were　more　concerned　with　other　factors.　Window　operations　in　maternity　wards　are　a　collective　strategy　for　natural　ventilation.　This　study　shows　that　the　factors　affecting　window　use　in　maternity　hospitals　are　different　from　other　buildings,　providing　useful　ideas　for　improving　maternity　ward　design.