Nursery: 6 weeks to 6 months* 
Toddlers: 6 months to 12 months*
Ones: 12 months to 18 months* 
New 2s: 18 months to 2 1/2 years old*
Twos: 2.5 years old to 3 years old* 
Threes: 3 years old to 4 years old
PreK:  4years old to 5 years old   
School-age: Kindergarten to 12 years old  

*While we strive to stick to our classroom ages, we also try to follow each child's development *