Is the Day of Birth Day 1? How Newborn Age Is Counted
Your baby has arrived. Friends ask how old the little one is, and suddenly a simple question gets complicated: is today day one, or is day one tomorrow? Doctors, growth charts, family traditions and parenting apps can all count differently. This guide explains the common counting systems with clear examples, so you can work out your baby’s age correctly in any situation.
MilkBaby Calendar team · Last updated August 9, 2026