Pelion has no less than 82 beaches, counting from Soutrali to Alogoporos and from Agia Kyriaki to Ovrios of Zagora. Unofficially there are a few more, but we'll leave that for AFTER you've visited these ones 😉
In order to fit them in a tour guide, apart from the general list up top, I've split them into 4 categories, depending on the profile of people most likely to visit them and I've placed each category on a Google Maps map, along with notes about each beach.
The full list
Without further ado, here's the full list of beaches in Pelion. I've added comments on each entry, to help you pick your choices.
Wild and beautiful
For the more adventurous among you, or for those without infants to worry about. It's either that the access by car is difficult, or that the access from where you park to the beach is difficult, or both. And it's a safe to say that you won't find any shops there, so make sure you've taken with you all that you'll need (and that you won't leave any of that behind).
Naturally beautiful, with shops
As above, but you'll find coffee and food, and some shops maybe. Sun beds and umbrellas are a maybe.
Touristic
Here you'll find the works, but it might get a bit busy, crowded and noisy.
A child's play
The touristic ones and from the natural ones only those that are accessible, not straight up on the road, with or without shops and you'll have one less thing to worry about.