There is no Western country importing unskilled immigrants.
The "yield" from crying babies is not 100%. Some will die before their productive years, some will succumb to disabilities, addictions, delinquency, or simply choose not to study and work.
Importing an immigrant cuts away all that "shrinkage", at zero cost to the receiving country (their country of birth bore that cost). It's such a good deal it's a no brainer, basically a tree that grows money. Not to mention it's immediate. Crying babies have a 18-22 year lag time.
Also, government incentives to have children usually stimulates immigrants and poor people anyway, if your argument is purely ethnoracial. You may as well take the 23-year-old Indian or Algerian dude. There is very little the government can do to make a white couple in Connecticut have babies.