To get a uk replacement rate of 2.1 we need half of women to have 3 DCs and 30% to have 2DCs. This is because it's been consistent historically (pre contraception etc) for 20% of women to never have DCs.
The jump from 2 to 3 is so big we need to make that step easier to not have the chaos of a bulge of elderly people and a shrinking working population.
It's not about never ending growth but about going back to c 50 million in the uk and keeping that steady.
Housing and childcare are the big disincentives atm.
Those are fixable by better social policies.
Push our elected representatives for the changes we need!