Australian Prime Minister Malcolm Turnbull's honeymoon period may be ending, with economists and political analysts blaming a lack of new policies for a drop in poll numbers that has reignited speculation of an early election.

Turnbull on Saturday announced more than a dozen changes to his ministry, a decision forced on him by the resignation of one minister, the retirement of two others and the sacking of two more over their involvement in political scandals.

A Fairfax-Ipsos poll of 1403 people taken on Feb. 11-13 showed the government's worst numbers since Turnbull ousted Tony Abbott in a party coup last September, narrowing its lead over the center-left Labor Party by 4 percentage points to 52-48 percent.