breastpads - how often do you change?

Kirsty

Just wondering how often you ladies have to change your breastpads? My little boy is 5weeks and 5days today, combining feeding (I don't seem to have enough breast milk!), but I noticed my pads have an awful smell if I leave them too long! Going through at least 2 pairs in 24 hours! Just wanted to see if that was normal?