Nobody warned me about the emotional intensity of the toddler years. I expected tantrums. I did not expect my 2-year-old to sob inconsolably because I cut her sandwich into triangles instead of squares. Or to feel genuine pride and satisfaction when she helped carry the shopping. Or to show real concern when the dog looked sad. Toddler emotional development is genuinely fascinating if you can step back from the chaos of it long enough to appreciate what is happening. Between ages 1 and 3, toddlers develop an enormous range of new emotional experiences and begin the very long process of learning to manage them. At around 18 months, self-conscious emotions emerge: shame, embarrassment, guilt, and pride. These require a sense of self, which has been developing since around 15 months when toddlers begin to recognise themselves in a mirror. Empathy develops significantly in the toddler years. Two-year-olds will offer their comfort object to a crying adult. They notice when others are upset and respond. This is the foundation of all later social and moral development. Emotional regulation, the ability to manage and modulate emotional responses, is the skill that takes the longest to develop. The prefrontal cortex, responsible for regulation, is not fully mature until the mid-20s. Toddlers are not refusing to calm down out of spite. They literally cannot do it yet without your help. Your calm presence during emotional storms is the most powerful regulatory tool available. Co-regulation, where your regulated nervous system helps calm theirs, is how toddlers gradually build their own regulation capacity. Name emotions constantly: I can see you are frustrated. You seem really happy right now. This builds emotional vocabulary which supports regulation.