I don’t document age-related mental development for infants. But I have written this blog about caring for an infant. It lists many sleep related milestones as well as other care related milestones for infants. It is long, but it was the product of a lot of research and condenses several books into a much smaller blog post. I’ve had many people tell me it profoundly influenced them. The research was current as of 2016-ish. New information may alter some conclusions. However, the main, overarching point in this is to respond to a child’s needs as promptly and fully as possible. I start giving surviving and thriving advice starting at 18 months on this page, but a solid foundation leading up to that is important. Please send the following to any expectant parents.