My classroom in an old house in downtown Phoenix, Arizona. I am teaching 10 toddlers with one assistant. The house is spacious yet I wouldn't add another child. It's self-defeating and chaotic to try and teach too many toddlers in a classroom space.
Toddlers crave space.
Space to move and space to learn to control their bodies and minds. Too many toddlers together create too many distractions. Many Montessori schools don't have toddler programs because of this. It's difficult for me to say what is happening at your school without observation. The character and credential of the staff is an integral part of the child's life, learning experience.