Thanks for the tip. I have a hard time letting him cry. That's why I became very good at making him asleep. Wife gives up early and passes him to me. I use white noise as final resort which almost always works.

Right now, after your comment, I didn't struggle too much and after a little tapping went for white noise and he is now asleep. I will lower the volume and turn it off in a while. It should slowly develop into new habit.