Hi, my son is 13 months old..he was completely on diapers till now ..till 1 year we didn't notice any diaper rashes. but now I can see some redness. I feel because of excess heat. does diaper size contribute to rashes ? when I was using L size I felt it's tight for him so I'm using XL.. even though solids leaks I'm using XL..should I switch back to L? when should I start potty training? And when I freed him from diapers I noticed he peed for 9-10 times in an hour..is it normal?