How to know if your baby is getting enough sleep

What do we do when we think our baby is not getting enough sleep?
We go online, of course!
The opinions are more or less similar, but we know that every baby is a baby and there is no magic recipe that will give us the answer.
Even so, we feel an internal satisfaction when we realize that, although the first search result says the baby should sleep 16h per day, on the second page it says that 14h are sufficient and we realize that our child is within what is considered “normal”.
But after all, how do we know whether or not the baby is sleeping enough?
It’s true that the ranges presented give us a general idea, but by observing the baby we can see if it is necessary to adjust something.
Insufficient sleep indicators:
🌱 Irritability and crying
🌱 Reluctance to fall asleep
🌱 Difficulty waking up
🌱 Falling asleep as soon as the car starts
🌱 Low responsiveness