If he is crying because he needs you - hugher pitched then go to him.
If he is MANTRA crying then don't go, a mantra is like Waa, Waa, Waa, the same pitch and tone.
Don't leave him to cry it out or try controlled crying when it is a 'cry for need', you will only break his trust.
Well done about the longer naps.
the Mantra cry is;
...an odd burst of a cry which most babies do as they are settling down. We don't pick up with a mantra cry. Instead, we hold back to see if the child can settle herself. We do pick up with a genuine cry, because its your babies way of saying "I have a need that has to be met".
Each mantra cry is individual, get to know your babies mantra cry sounds like. You'll see it when she's physically overtired, she'll blink and yawn, and her leg and arms fail if she's overtired. She'll also do a kind of "waa.....waa...waa...."sound, like a mantra that repeated over and over, the pitch and tone is the same throughout. It does not sound the same as a genuine cry, which escalates in volume. - TBW -SAYP p235