Hello! Tell or say, please, on what given (to formulas or it is established or installed...

[Natalia]

Hello! Tell or say, please, on what given (to formulas or the established or installed sizes of a fetus) opredelejaetsja a duration of gestation on US?

[Light]

Duration of gestation start to count from first day of last monthly though real conception, most likely, has occured or happened weeks through two.