Man is charged after allegedly throwing a three-week-old baby across a bed and forcing a dummy into the newborn's mouth

A man has been charged after allegedly assaulting a three-week-old baby by shoving a dummy in the infant's mouth.

Police allege that a 28-year-old man forced a dummy into the mouth of the newborn about 1.30pm on Wednesday at a home in Goulburn, 190km south-west of Sydney.

It is then alleged that he tossed the child across a bed. 

The infant was treated by medical professionals immediately, officers said. 

Police from Hume Police District launched an investigation on Friday following reports of the alleged incident.

The man was arrested about 9.50pm that same day and has since been charged with common assault.

The 28-year-old was refused bail and appeared before Parramatta Local Court on Saturday. 

He will remain in custody until his next court appearance on October 28.