An average baby's cry decibels start at 90 decibels and can reach a maximum of about 120 decibels. This is equivalent to the sound of an aircraft taking off, so it can be quite loud in comparison to other environmental sounds.
It is important to note that a baby's cry decibels can vary depending on the baby's age and the type of noise they are exposed to. For instance, a baby may cry louder if there is a loud noise in the environment like a car horn or an ambulance siren.