Baby Date Calculator: Helps You Predict Your Baby\’s Date of Birth Dates are very important for expectant mothers and families because they help you prepare for the birth. If you\’re pregnant, you can use a due date calculator to predict your baby\’s birth date. Below we will introduce this topic in detail from various aspects such as pregnancy period, pregnancy reactions, delivery methods, and maternal nutrition. Calculation of pregnancy period. Know your pregnancy period to calculate the date of giving birth.