try Goon, I use the japan version, bought from shopee, the absorbance is quite good. and maybe u should use a size up. like e.g ur baby already 6kg, u might want to try M instead of S. as long as baby not lying on her side shouldn't be any leaking 😁
If your son is starting to crawl and turn . May want to start pant diapers
Seems like his diapers might be too small for him
Maybe the Tape diapers are too small or wrong fit
Maybe try a size up