Developmental Psychology By ashleighmoore30 Apr 7, 2017 Newborn an infant who is only hours, days, or a few weeks old Apr 7, 2017 Infant a very young child or baby Apr 7, 2017 Toddler a young child who is just beginning to walk Apr 7, 2017 Child a young human below the age of puberty Apr 7, 2017 Preteen a child just under the age of thirteen