ealthy Infant Sleep 101 Come learn about the biology of sleep in babies, from what current neuroscience and infant mental health tells us. What is developmentally appropriate to expect at different ages and stages? How long do I let my baby cry for? What is healthy stress for a baby, and what is toxic stress? Learn why babies wake up at night, how adult sleep differs from baby sleep, and what you can do to cultivate healthy sleep habits that will last a lifetime. You will leave with a better understanding of how to support your baby and your family.