"The theft occurred overnight on Thursday 27 February causing minor damage to the shed," he said. "The shed has not been broken into before.
"The toy library will continue to operate, but there will be less toys available," he added.
Police said they received a report of a burglary at an address on Flanders Ave on Friday February 28.
The incident is thought to have occurred between the evening of Thursday February 27 and the morning of Friday February 28, according to police, and it is reported that some toys were taken.
Plunket Hawkes Bay's facilities include two family centres and nine clinics in the region.
A post on the organisations Facebook page said the staff were "really gutted", claiming their "tamariki are suffering".
The post said the organisation had a number of large items stolen, including a red tunnel and blue mats.