Not exactly sure what you are suppose to be teaching your toddler? What they are suppose to know? Check out these ideas and breakdown of toddler development for ages 1 year, 18 months, 2 years and 3 year olds. Describes the 5 areas of toddler development: cognitive, social and emotional, motor ( gross motor and fine motor), montessori practical life skills, and speech development in toddlers according to milestones of early childhood development.