Editor In Chief

Calculate the percentage of weight loss from birth weight to current weight for a newborn, with optional age in hours and feeding method inputs for context.

Estimate a baby’s average daily weight gain based on birth weight, current weight, age, and unit system. This calculator helps track growth over time by calculating the difference between birth and current weight and dividing it by the baby’s age in days.

Estimate the baby’s half birthday date in days from birth by adding about six months. This calculator uses the baby’s current age and month length assumptions to estimate when the 6-month milestone occurs and how many days remain until it.

Estimate the age gap between two babies in months based on the older baby’s age and the younger baby’s age, with an option to enter ages in months or convert from years.

Calculate the age difference between two babies in months using years and additional months for each child. The result shows how many months apart they are.

Estimate a baby’s chronological age, corrected age, or due date timing using gestational age at birth and time since birth. Useful for premature and full-term infants when tracking development from gestational age.

Calculate a premature baby’s corrected age in weeks by adjusting chronological age for how many weeks early the baby was born. Corrected age is commonly used to track growth and developmental milestones in preterm infants.

Calculate a baby’s chronological age in months from birth details and the current date. This calculator estimates age by converting the difference in years, months, and days into total months.

Calculate corrected gestational age for a premature infant using gestational age at birth and chronological age since birth. Corrected gestational age equals gestational age at birth plus chronological age.

Calculate a premature baby’s corrected (adjusted) age by subtracting the number of weeks born early from the chronological age. Adjusted age is commonly used for growth and developmental milestones during the first 2 years.

Calculate a premature baby’s adjusted age by subtracting the number of weeks born early from the chronological age. Adjusted age is commonly used for growth and developmental milestones during the first 2 years.

Calculate a premature baby’s corrected age by subtracting the number of weeks born early from the baby’s chronological age. Enter the baby’s current age since birth and gestational age at birth.

Calculate corrected age for a premature infant by subtracting the number of weeks born early from the chronological age. Enter the baby’s current age and gestational age at birth to estimate corrected age in months.

Calculate a baby’s age in months from birth date and current date details, with options to estimate using average month length or exact calendar month progression.

Calculate a baby’s age in weeks based on current age in months, additional days, and whether the baby was born early or late.

Calculate an infant’s age from birth and display the result in days, weeks, months, and adjusted months based on birth details.

Calculate a newborn’s age from birth using weeks, additional days, and hours since birth. This helps express age in total days, which is commonly used for newborn tracking in the first weeks of life.

Calculate a baby’s age in years using their age in months, weeks, and days for a precise year-based result.

Calculate a baby’s age in completed months using birth date and current date details. This calculator estimates age in months based on years, months, and days between the two dates.

Calculate a baby’s age in weeks based on their age in days, months, and years. This helps convert a baby’s current age into total weeks for developmental tracking and milestone planning.

Calculate a baby’s exact age in days based on the current age in years, months, and days. This calculator uses a standard average month length to estimate total days and is useful for tracking infant milestones and development.

Calculate a baby’s age from birth date and current date inputs, showing the age in total months with detailed date-based adjustment using years, months, and days.