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.
A human baby in his first year of life is referred to as an infant. However, until they complete first three months of their lives, small babies are newborns and technically they are infants between 3-12 months of age. However, there are places where human babies up to 3 years of age are referred to as infants.