Not sure if this is an impossible ask but DS 3.5 is still in night nappies and we're fed up buying disposables. However they are still wet frequently enough that we know he'll need a nappy for a while yet. Do reusables come in sizes big enough for a slim but tall lad who'll be four in August? He has a wee sister 2 yrs behind so if we can find something it'll get enough use for it to be financially worthwhile and we used washables for the first 6 months with ds so am happy to get back into the whole routine. Any brand suggestions and sizing ideas so I can start internet hunting? Thank you!