The hate-filled web users began taunting the singer, 24, just minutes after the birth was confirmed on Saturday, the Sun reported.
The most disturbing message came from a user called name Vanessa Bieber, who wrote: ''Aw Adele gave birth to a baby. Is it fat and handicapped lol? Just murder it already lol.''
Another Twitter user wrote: ''I’ll go see her in the UK and kill her'', while another retweeted the message, adding: ''And kill her baby.''
Many other users wrote that Adele would have more material to write about if she suffered from post-natal depression, or if her son died, while others said they hadn''t realised Adele was pregnant because she is overweight.
Some even threatened to kill her if she chose their favourite baby name for her son. A Twitter user said: “I see Adele has given birth to a boy. If she randomly picks my baby name I may have to kill her.”