Baby won't stop crying

Every time it's bedtime he cry nonstop I'm going back to work soon and my mother will be looking after she say I spoiled him because every time he cry I pick him up. She say if there's nothing wrong with him just let him cry until he fell asleep, his just turn one month today.i don't like when he cry nonstop and I'm afraid when I go back to work they let him cry himself to sleep 😣😔😕any suggestion on how to teach to help him go to sleep with out all the crying?