The association and now parliamentary club, Development Plus (Rozwój Plus), broke away from the opposition Law and Justice (PiS) party earlier this year under Morawiecki's leadership.
At a press conference in Warsaw, its MPs presented findings from their own report on Poland's declining population.
MP Agnieszka Ścigaj said Poland's population had fallen by 158,000 in the past year alone and that projections suggest the country could have almost 10 million fewer people by 2060.
Under the proposal, one parent of each child under three would receive a minimum-wage payment, fully taxed and pensionable, with entitlement to public healthcare.
The allowance would not be tied to employment, meaning parents could combine it with work or full-time childcare at home.
Once a child turned three, families would move onto Poland's existing 800+ child benefit scheme.
MP Marcin Horała said the measure was designed "to preserve choice," rather than favouring either working parents or those who stay at home.
The salary would replace existing benefits for children aged nought to three, with funding redirected from those programmes.
A second proposal, outlined by MP Szymon Szynkowski vel Sęk, would see a quarter of every worker's pension contribution paid directly to their parents rather than into their own pot, split evenly between both.
A safeguard would apply to those without children: from age 50, a rising share of their contributions would revert to their own pension, reaching 100 percent from age 60.
Szynkowski vel Sęk said a couple with four children could see their pension roughly 40 percent higher after 20 years under the scheme.
Development Plus's report also calls for stronger maternity care, extended after-school childcare, and greater job security through limits on short-term contract work.
MP Robert Gontarz invited the public to contribute ideas via the initiative's website, saying the best solutions would come from open debate.
(ał)
Source: PAP