Please refer to the Size Chart when you purchased:
Age--------------------------Top Length----------Chest--------------Pants Length
Age 0-6 Months-------13.0"/33cm-------10.2"/26cm--------14.9"/38cm
Age 6-12 Months-----13.8"/35cm-------10.6"/27cm---------15.7"/40cm
Age 12-18 Months----14.5"/37cm-------11.0"/28cm--------16.5"/42cm
Age 18-24 Months----15.3"/39cm-------11.4"/29cm--------17.3"/44cm