Massachusetts median income is 114k, child is 44k.
Mississippi median income is 56k, child is 19k. Using 2 data points, it looks like it scales.

Data source: https://www.fool.com/money/research/average-us-income/

In CA and we pay north of $40k in daycare alone for each kid.

Live in MA and pay a nanny about $55k a year. Its brutal and pushing our finances to their limits but we tell ourselves its temporary pain (2 years) to ensure the long term wellness of our child.