If the mud is willie height then it's too deep LOL
IMHO kids wellies are short as kids legs are short (esp toddlers) and they need to bend their knees! We used waterproof trousers over wellies (from go outdoors/millets etc ) and these are easy to put on or leave off depending on the weather .
whoops! Wellies obviously! That's what I thought the reasoning probably was but especially for dd1 who is 7 for walking to school waterproof trousers aren't ideal, though we have some for if we're going for a muddy walk. What I don't understand is they could be quite a bit longer and they'd still be able to bend their legs! Has anybody got/seen any?
Also, longer wellies are heavier for little legs. Probably not a problem at 7, but my friend used to have to seek out really cheap, light wellies for her diddy weedy 2 yo. The lovely rubber HAtley type ones were too heavy.
If you want hunters but discounted I've found amazon warehouse is good for them. Amazon sell off customer returns cheaply rather than adding them back into stock. They say you won't get the box etc but I've found mostly you actually do and if you aren't in a hurry you can pick up wellies for kids for less than £20, doc martens for £30 etc. You do have to keep checking as obviously they only have what people have recently returned but you might have the luxury of time as the weather is currently marginally improved!