I'm not sure if they have measurements so that you can compare a Small to a Medium for example. I think I might message them and see what they say. I think they can be adjusted, like you can with regular human swimming googles, but I'll double check before ordering them. They're coming from the US, so I can't be buying these in the wrong size as it'll be too costly to send back and get a replacement size
Silly question, but if Riley is still growing... will his head still be growing too?!? Or just his body (I'm laughing at how ridiculous this sounds as I read this message back...)