I would definately recommend using a one size diaper if you were only planning on useing them for one child as they do get alot of wear from one. I would not however recommend using a AIO. I had some for my 3 yr old to wear to bed and they are horrible! To clean them takes too long. I have to wash them once and then turn them inside out and wash them again and I still don't feel that they are getting that clean! They also take longer to dry and I ended just throwing them out because nothing seemed to help. I tried washing them differently, line drying/dryer and different detergents. They are not worth it and it really dosen't take much to fill a pocket diaper.
The only issue you may have with the one size, I discovered as I have some I use on my 8 month old and would put on my 3 yr old at night is that they didn't really fit her. She is a very slim girl and they were still to narrow for her. Good luck
at 6:58 AM on Jan. 2, 2009