My daughter isn't quite 18 months and she is short so I knew it would be too big for a while, but the adjustable velcro sides and cuffs pulled it all in nicely. Most importantly, she remained dry on the first outing, splashing in lots of muddy puddles. Far better than the puddlesuit we had from a large high street camping store. The elastic cuffs to keep the feet down over her wellies are brilliant. It's a little hard on nappy changes as the zip stops at the crotch, but I will take that rather than risk her being soaked through her trousers again. The velcro did keep catching on my wooly jumper, but I will pay more attention to what I am wearing next time! Wonderful suit and have already recommended to a friend.