From the first reflexive grins to the burst of a first giggle, babies reveal their growing capacity for connection in wonderfully individual ways. This warm, evidence-aware guide explains how facial expressions develop, when a social smile may emerge, why laughter can arrive later, and what your baby may be communicating. You will learn to distinguish spontaneous early smiles from responsive smiles, notice the role of voice, eye contact, movement, and familiar people, and support playful interaction without turning milestones into deadlines. It also addresses premature birth and corrected age, temperament, sensory differences, cultural expectations, and the many normal reasons a baby may smile or laugh less visibly. Practical observation checklists and gentle play ideas help you respond with curiosity rather than performance pressure, while clear guidance explains when a persistent concern deserves a conversation with a pediatrician or health visitor. Whether you are capturing a fleeting grin or waiting for that unmistakable chuckle, this book offers reassurance, context, and a respectful way to enjoy the journey. Part of The Smile and Happiness Library.