I went through it with my wife too and expecting a 19 y/o women to go through the IVF process as an insurance policy is a bit insane to me. In our modern, western society, this is age is still solidly childhood with not much definitive thoughts of future family, marriage, etc.
Governments need to make COL more affordable, birth rate will go up naturally
We definitely need better COL but I'm not convinced it's is the main factor for low birth rates as most countries living in poverty have very high birth rates. I think its a cultural difference that values earlier marriage and heavy family involvement in raising children which, the latter, reduces the stress of having to parent by yourself.
Calling 19 "childhood" is crazy. Most teens have an understanding of what they want their life to look like.