If you have watched two toddlers interact for any length of time you know that sharing is not exactly their natural state. My daughter once screamed for 10 minutes because her baby brother looked at her toy from across the room. Sharing is actually a developmental skill that toddlers are genuinely not neurologically ready for before around age 3 to 4. Before then the concept of mine is extremely powerful and completely normal. So what can you actually do in the meantime? Teach taking turns instead of sharing. Turns are concrete and time-limited: your turn, now my turn. This is easier for toddlers to understand than the abstract concept of sharing. Use a timer for turns: 2 minutes on the timer, then it is the other child turn. Name what you see: you are waiting for your turn, that is so patient. Practice sharing with you, not with other children first. Play games where you take turns passing objects back and forth. Do not force sharing but do enforce turn-taking. Never shame a toddler for not wanting to share. Read books about sharing and turn-taking. Model sharing yourself and narrate it: I am sharing my crackers with you. Real voluntary sharing typically emerges around age 3 to 4 as empathy develops.