What Toddlers Believe About Thoughts. Sources- juliewise4 on TT PMID 27184176 Theory of mind is the ability to understand that other people have their own thoughts, feelings, and perspectives that may be different from one’s own. In toddlers, this cognitive skill is still developing, and before it matures, children often assume that everyone knows what they know or sees what they see. For example, a toddler might hide a toy and expect you to know where it is, simply because they do. This stage i