When I clicked desert villager with villager spawn egg, just common baby villager came out

This is intended, because baby villagers don't have jobs. And please change your title to be in English, so everyone can understand

@Phan Tuan Minh This is an issue with the villager's biome detection, not the profession, You can see in the screenshot that the baby is a plains one. Also, the title has the exact same meaning as the description. I bet he used a translator or sth. 

@Kim hee 제보해주셔서 감사합니다.  사막 주민에게서 평지 주민 아기가 나온다는 얘기죠? 다음에는 번역한 내용을 제목에 적어주시기 바랍니다. 

Thank you for reporting. Are you talking about plains villager babies comming out of desert villagers? Please put the translated text in the title next time.