My friend filed at H and R block and they told her everyone with a child that makes under $40000 get $5000 back automatically and my taxes don’t show I get that much back

[DoninGA]

That is hogwash.  
Whomever said that either does not understand the tax code or is totally incompetent.
The Child Tax Credit is only available if the child is under the age of 17.  The CTC is up to $2,000 for an eligible child.  The maximum amount of the Additional Child Tax Credit (ACTC) has increased to $1,400 per qualifying child.
IRS Publication 972 Child Tax Credit - <a rel="nofollow" target="_blank" href="https://www.irs.gov/pub/irs-pdf/p972.pdf">https://www.irs.gov/pub/irs-pdf/p972.pdf</a>

[xmasbaby0 · Accepted solution]

Do not assume your refund will include $2000 per child for child tax credits.  It does not work that way.  The CTC is used first to reduce your tax liability to zero. After that, there is a refundable portion called the Additional Child Tax Credit that is calculated based on the amount of income you earned.  You do not necessarily get the maximum amount.  You get 15% of the amount of income earned above $2500--UP to the maximum amount possible.

As for EIC:

The IRS offers a tool to help you estimate your EIC:

https://www.irs.gov/credits-deductions/individuals/earned-income-tax-credit/use-the-eitc-assistant