But a man may not have any of these symptoms and still have prostate cancer, says Gerald Chodak, MD, a Chicago urologist and author of Winning the Battle Against Prostate Cancer: Get the Treatment That is Right for You (Demos Health).
I had no idea there was so much discrepancy in opinion. Newborn is 0-3 months. Infant is 3-24months. Toddler is 2 until 4. 4-5 is preschooler. At 8-12 they become a tween. Teen is 13-18. Young adult is 18-29. 30-65 is middle age. 65+ is a senior.
â¢ By Two Months of Age â¢ By Four Months of Age â¢ By Six Months of Age â¢ By Nine Months of Age. â¢ By 12 Months of Age â¢ Atypical Development. Human infants need intensive care and nurturing from birth until they are able to live competently within our complex world. Although an infant is almost helpless at birth, he has some skills and a strong set of reflexes to help him survive. While some of these reflexes gradually disappear, his skills grow rapidly during his first 12 months.