Part of the problem is that even people who are truly adamant about not wanting kids won't be sterilised in all cases no matter how much they want it. Took me about 20 years of constantly being on the verge of almost killing myself and being potentially dangerous to others before I managed to find someone who'd make sure I can never reproduce ever.

Everyone else insisted I'd just eventually find the correct partner.

Getting it done finally gave me my much needed peace of mind and as a result has drastically reduced the amount of problems I had.

You can set up a situation in which you observe the way a parent interacts with a kid. They way they talk with the child, the way they play together are all incredibly important for good language development and can be an indicator for how the parent will be interacting with their child at home once they're born.

Even having classes where future parents learn about how to raise their child in a good way would be a good start. Make it mandatory and not something you choose to do. Chances are that parents who do partake in such classes aren't the parents that need to be taught about it in the first place.

Point is, there's plenty things you can and should offer - everything's better than having nothing of that sort right now.