It’s recommended to measure your baby’s growth to make sure that they are growing and developing along their growth chart correctly. With newborn babies it is common to lose weight in the first week after birth which they usually regain by their second week. Growth charts for newborns allow for this. Every baby will grow at different rates and these percentile growth charts are only one way of monitoring healthy growth and development. If you are worried about how much your baby is drinking, eating, or their weight gain, contact your healthcare professional. It is particularly important to contact your healthcare professional if you notice that your baby's growth changes dramatically to make sure that there is no underlying conditions affecting their growth and development. Additionally, if your baby consistently falls below the 5^th percentile or above the 95th percentile. Every baby is different so it may not be a cause for worry, but it’s worth getting checked out by a healthcare professional for further evaluation and guidance.