You're comparing the average expenses to the median income, which isn't the right measure. You're also comparing average household expenses to individual income.
But let's assume you weren't. $1300 per week adds up to $5,633 per month. If you're comparing that to average monthly expenses of $5,253, that means the average household has $400 left over per month. That's a savings rate of around 7%, which is actually higher than the measured U.S. average of about 3%.
"The average monthly expenses among all households totaled $5,253, or $63,036 annually. That's up 3% from 2018."
That's not much of a margin for error or opportunity for savings. If you're dual-income, child care will eat up the entire second income. Most couples I know having children these days have one parent quit their job and stay home, even if they were in an otherwise lucrative field such as software and especially if they're in anything else such as teaching, retail, warehouse, etc.