The number of children who were not appointed a child safety case worker within the recommended time frame has jumped up by 60 over the past 12 months.
Human services dashboard data released on Friday showed 105 children had not been allocated a case worker within priority time frames last month.
This was up from 45 children last September.
Priority time frames for allocation to a case worker are the same day for priority 1 children, five days for priority 2, and 10 days for priority 3 investigations.
Labor child safety spokeswoman Sarah Lovell said child safety workers in Tasmania were stretched to their limits.
"It is very concerning to see those measures get worse and worse, month after month," she said.
"It is just not good enough that children who are potentially at risk are being left without an adequate response.
"The latest child protection data is indicative of an under resourced system."
Government minister Michael Ferguson said an additional 13 staff had recently been employed to work in the child safety area.
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"Since we introduced our new referral service in late 2018, the number of cases going to investigation has reduced by a half," he said.
Mr Ferguson said the government had invested $50 million in a redesign of child safety systems.
"What we can't control is what happens in the family home, but what we can control is our resources for families to support them and prevent the need for child safety notifications to come to government in the first place," he said.
The dashboard data showed 1304 Tasmanian children were in out-of-home care in August.
The government announced the Strong Families Safe Kids reforms in 2016.
A evaluation of the reforms by University of Tasmania academics last year found more work was to be done if the anticipated impacts on Tasmanian child wellbeing were to be realised.
Strong Families, Safe Kids Advice and Referral Line can be contacted on 1800 000 123 between 8.30am and 5:00pm, Monday to Friday.
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