A 26" Mini is way too small for any child.
Originally Posted by My2Geldings
Absolutely they can be ridden by really small children, you just have to train them like you would a regular sized horse. Miniatures are fantastic companion animals to not just horses but other various animals as well. To feed they require next to none. In fact I wouldn't change anything feeding wise to the other 2 horses you already have. Expense wise farrier trims and shots are the 2 things you will have to worry about more than anything.
They are very easy to care for.
34" Minis can be ridden by small children of under 70 lbs. And that weight includes the saddle. I see too many parents allowing much older children and even teens, to ride Minis. That is abuse. Much better to train them to the cart.
Many Minis do suffer from straight rears and stifle issues. They are very prone to foaling problems. They should be kept on dry lots and fed carefully. In lush pastures they tend to become fat and can founder very easily.