...every pair of hands contributes to pursuing well being.
Agreed. Having a large family, "many hands", allows for more members of the family to carry out needed work: caring for other members of the family, tending to livestock, crops, etc.
The best thing to control the population and improve wellbeing is to improve education and improve opportunities for women.
Strongly agree.
...but forcing it upon people and depriving them of their livelihood is not good.
It may seem harsh and tyrannical, but China's policy of enforcing the "one child per family" has lowered their nations Total Fertility Rate.
Environmental Science: A Global Concern writes:
China's one-child-per-family policy has decreased the fertility rate from 6 in 1970 to 1.8 in 1990 and 1.7 in 2005.
same source writes:
This policy, however, has sometimes resulted in abortions, forced sterilizations, and even infanticide.
A double-edged sword, it seems.