In your case, you have taxable income, but no tax liability due to the EIC. Taxpayers in this situation are entited to a $300 rebate with an additional $300 for your dependent. Below is an excerpt from the IRS web page that covers your situation. I have also provided a link to the page.
Q. I want to estimate my payment. Please explain how it is figured.
A. Essentially, there are two parts to the stimulus payment: a basic amount based on tax liability, filing status or other qualifying factors if there is no tax liability and an additional amount based on whether a qualifying child is reported on the return.
Basic Amount of Payment: Taxpayers who had a net income tax liability will receive a payment, unless they can be claimed as dependents on someone else's return, are high-income individuals or do not have a valid Social Security Number. The payment is equal to the taxpayer's net income tax liability, but no more than $600 for a single person or $1,200 for a married couple filing a joint return. The minimum payment is $300 for a single person or $600 for a married couple filing jointly.
People with no net income tax liability will usually get a minimum payment of $300 for a single person or $600 for a married couple filing jointly, as long as they have qualifying income of at least $3,000. To figure your qualifying income, add together the following amounts:
Extra Money for Qualifying Child: Eligible taxpayers who qualify for a payment may receive an additional $300 for each qualifying child. To qualify a child must be under age 17.