| | Family Health | Baby Health How many inches is a baby at birth? On average, a newborn baby is about 19.5 inches (49.5 centimeters) long. However, some babies may be born a little shorter or longer. Baby Health - Related Articles How to Make an Oral Rehydration Solution at Home Infant Tooth Development Infant CPR Techniques What Is the Normal Infant Birth Weight? What can I write for a baby shower that is funny first time parents? Infant Wellness What You Know Can you find out before 3 months if baby has Downs syndrome?