At night my child is wetting through her usual daytime diapers! Do I need to buy new diapers with more layers of fabric?
No. I would not recommend a diaper with too many layers of fabric. They are hard to wash thoroughly and take a very long time to dry. I would use a daytime diaper and add a diaper doubler or two to reach the absorbency that is needed. The second option would be to use usual diapers for the day and diapers with more absorbency for night and nap times.