Struggling with an overtired baby who won’t sleep? This complete guide for new parents explains what overtiredness is, why it happens, and how to calm an overtired baby with proven soothing techniques. Learn how to spot early tired cues, use swaddling, white noise, and skin-to-skin contact, and create a calming bedtime routine. You’ll also find prevention strategies like following wake windows by age, avoiding overstimulation, and keeping sleep consistent. Whether your newborn is fighting naps, crying at bedtime, or waking restless, these expert-backed tips will help both you and your baby get the rest you need.