Police are investigating at a house in Montgomery St, Hastings, after a 5-month-old baby was admitted to Hawke's Bay Hospital yesterday.
Five patrol cars arrived at the address about 11am and officers assessed the backyard from an adjacent property.
"The baby was admitted [yesterday] morning," said Detective Senior Sergeant Dave Greig, child-protection co-ordinator for Eastern Police District.
"Initially we had fears for the health of that baby.
"It appears the baby has suffered a head injury but it doesn't seem to be serious. The child is responsive, awake and feeding."
Police would continue their investigation into circumstances surrounding the incident and a guard had been put in place to secure the scene.
"We haven't made any arrests, we are just trying to establish what happened."
The child remained in hospital for additional tests and examinations.
Hawke's Bay Today approached the baby's grandmother, who had received confirmation that the head injury was minor: "The main thing in our minds was the baby, but I have heard that it's okay. It was a little bump to the head, not a major injury."