A teaching assistant suffered a miscarriage after a pupil kicked her in the stomach, a survey by UK trade union GMB union found.
She is among the more than half of school support staff in Britain that have suffered violence at work, with some threatened by parents.
Assaults named by members of the union included stabbings and attempted strangulation by an eight year old.
Teaching assistants and other school staff have said they were kicked, punched, and bitten.
One person told GMB they had faeces thrown at them, while others said they had been spat at and had their hair cut off.
The anonymous teaching assistant said: "I was pregnant and a child kicked me really hard. After that incident I started bleeding and lost my baby.
"I fell into a deep depression, especially as the school did nothing to support me."
A survey of almost 4800 school support workers revealed a catalogue of violent incidents involving children as young as eight.
Just over half said they had experienced violence at work, with more than 770 saying they were attacked every week.
One support worker had a chair thrown at her. Another had a piece of cement thrown at him.
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