During the first two years of life, neurological, physical, and cognitive growth occurs with extraordinary speed. A 4-week-old infant has vastly different nutritional and developmental needs than an 8-week-old baby.
The Science of Weekly Pediatric Tracking
Pediatric growth charts (such as WHO and CDC percentiles) and immunization schedules are calibrated in precise weeks and months rather than years. Counting weeks prevents developmental misdiagnoses.
Calculate your child's exact age in weeks and days on AgeCalculate.net.