A 23-year-old man was arrested on suspicion of kidnap.
Speaking about the incident, Detective Inspector Tony Lunt of GMP Bolton CID said;
"This was an incredibly distressing incident during which a child received serious injuries."
Officers praised a member of the public who helped detain the man.
The suspect has been taken into police custody where he will be questioned.
Police confirmed the child's injuries are not life-threatening, but they're extremely shaken.
"The mother is receiving support from specialist officers at this time."
Police stressed that this is an isolated incident.
"I would like to reassure you that this is being treated as an isolated incident.
"There is not believed to be any wider threat to the community."
Police confirmed there will also be increased patrols in the area following the incident.
The investigation is ongoing.
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