I finally organised all of baby's clothes in her dresser and then it hit me, should I have pre-washed them all before she's born?

Yes, I washed my baby's clothes and sun them around 35 weeks into my pregnancy. The baby clothes should be washed before using baby detergent liquid/powder to reduce the allergic to baby's skin. I use pigeon liquid detergent, which can get easily from NTUC department store.