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.
Report Abuse. 1  What Is An Infant. Source(s): https://shrink.im/a9kAQ. 2  what is the age considered an infant by WHO. Cele Â· 1 year ago. 3  To a lot of parents, there is really no telling. My oldest son became a toddler at 8 months, that's when he began walking on his own.  In common usage--up until toddlerhood (about 12 months).