It sounds like you're asking for the plot of Doraemon Season 17, Episode 44. However, please note that episode numbering varies significantly between different versions of the anime (e.g., 1979 series, 2005 series, and regional broadcasts like USA or India).
Desperate, Nobita uses the Small Light to shrink himself and search the sewer. Inside, he encounters a lost baby crow who has swallowed the key, thinking it was a shiny pebble. Nobita befriends the crow, but Gian and Suneo — also shrunk — chase him, thinking Nobita is faking the crisis to avoid practice. doraemon season 17 episode 44
After a muddy chase through underground pipes, Nobita gets the crow to cough up the key by offering it a piece of candy from Doraemon's pocket. Gian, impressed by Nobita's determination, calls off practice. It sounds like you're asking for the plot
Anywhere Door, Small Light, Take-copter (briefly). Inside, he encounters a lost baby crow who
Nobita is excited for a summer trip to a tropical island using Doraemon's Anywhere Door. However, in his haste, he accidentally drops the door's special key — a small, golden, magnetic device — into a sewer grate while running away from Gian, who wants him to join a grueling baseball practice.
Based on the most common modern numbering (the , sometimes listed with 26 episodes per season on streaming platforms like Disney+ or Amazon in certain regions), Season 17 typically falls around 2018–2019 in Japan.
August 23, 2019