The health visitor's union Unite is calling on its members to reject the government's three-year pay deal.
The Department of Health has proposed a deal worth 2.75% this year followed by rises of 2.4% and 2.25%, plus extra for the lowest paid staff.
But Unite say this is not sufficient, despite the government warning that they may stagger or reduce the pay deal if it is not accepted.
Unite officer Peter Allenson said: "This three year pay deal is not sufficient for us to be able to recommend acceptance to our members.
"We have reservations that the renegotiation clause, which should come into effect in situations of rising inflation, is not strong enough and that in a climate of economic insecurity, it is not at a level sufficient to meet our members' needs."
Unite say that after consulting with its members, it will recommend they reject the pay offer.