The majority of nappies fasten using with either Hook and Loop (the proper term for the generic use of ‘velcro’) or Snaps. Exceptions are some fitted nappies that use a ‘nappy nippa’ (a stretchy Y shape with hooks on 3 points) and Pull Up styles, either as a whole nappy or in cover form.
Some brands offer a choice in the same style but most stick with one type of fastening or other. It may be a factor in deciding if a nappy is for you or it may not matter at all.
Hook and Loop closure often allow for more precision fit, as the options are not restricted to the position and spacing of the snaps. It’s common for child care providers and the less experienced user to prefer these for ease of use. It’s also worth mentioning that hook and loop can be preferable for anyone changing nappies that has hand mobility issues as snaps can sometimes be tricky and there are a few of them to do at each change.
Hook and Loop fastening needs protecting during washing and drying to prevent ripping and attracting fluff. Cloth Nappy users often find that older babies and toddlers can often undo a hook and loop fastening themselves which understandably can cause problems. A Snap fastening can present as a ‘tidier’ nappy and requires less care, possibly extending the life of a nappy. They are also easier to replace.