Are you going to change the baby's diaper? Follow these steps. When is it necessary to change the baby diaper? Each baby is a baby and with time you will know your baby habits and needs. When in doubt, if a lot of time has passed, check if the diaper is dirty . Change the diaper whenever the baby has wet it and as soon as possible, especially if the baby has pooped. On average, in the first few months, it is necessary to change the diaper every 3-4 hours and after the baby eats. It is common to need about 10 diapers a day in the first few months. Text from the maternal health nursing team at Hospital da Luz Guimarães. The content published in the Health Guide is intended for the general public and is provided for informational and educational purposes only. It does not replace individual medical assessment, diagnosis, or personalized clinical advice from a qualified healthcare professional. The content is produced or reviewed by physicians and other healthcare professionals at Hospital da Luz and is based on the knowledge available at the time of publication or the most recent update, as indicated at the beginning of each item.