When does a newborn’s face change from reflexive movement to a smile that seems meant for you? This reassuring, evidence-aware guide helps parents notice the difference without turning development into a test. Explore why early smiles appear, how vision, hearing, voice, touch, sleep, feeding, and familiar routines shape social connection, and what to expect across the first months. You’ll learn how to respond in ways that invite interaction while respecting a baby’s temperament, sensory needs, and changing energy. Clear explanations distinguish spontaneous, reflexive smiles from responsive social smiles, explain corrected age for babies born early, and show why one quiet day says very little. Practical observation prompts help you record meaningful patterns without comparing your baby with other families. The book also addresses uncertainty compassionately: when to mention a persistent concern to a pediatrician or health visitor, and how to protect your own wellbeing while waiting. Whether you are watching for the first grin or simply hoping to feel closer, this guide turns a fleeting expression into a grounded, joyful beginning. Part of The Smile and Happiness Library.