Norwich boss Philippe Clement felt the Canaries lost 2-1 to Birmingham at Carrow Road because of their poor start.
Norwich trailed 2-0 after just 14 minutes before they staged a comeback in the second 45 minutes, which Clement hailed as their best half under him.
The Belgian told BBC Radio Norfolk: "There were different parts to the game. In the first 20 minutes, were by far not good enough and not what we have been doing in the last few months, not on the front foot, not enough tempo on the ball, not finding the solutions and defensively giving away too much space.
"In the second half we changed it and we started to play better. At half-time, we could talk about the things which were totally not good, to go into details with the ball and without the ball.
"The second half was maybe the best half under me, I think. The passion, the quality on the ball, the chances, and a good goal.
"We were really unlucky not to have the points. We had 62 per cent ball possession, we had more chances than Birmingham, but they go home with the points and we lost the points in the first 20 minutes."