T.D.
even if a child is at the starting weight for a diaper it can still leak. it all depends on the style of the diaper and how it fits the child. i f i were you i would go with the goodnights ones and try it out for a night or two to see if it will work like you want to. my guess is if a disposable can handle it then a washable one with a disposeble liner should hold just as well. but i would also have a waterproof mattress pad on the mattress and a change of sheats and pj's ready for a quick change if needed for a leak in the night.