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@Nealham12 wrote:

Couples that are married filing separately receive a reduced credit that is equal to half of the typical credit amount. Currently, parents can receive up to $3,600 for every child under 6 and $3,000 for kids between 6 and 17. Married couples filing separately are only eligible for  $1,800 and $1,500, respectively. This is because when married filing separately, only one parent can claim the child tax credit, not both.

This is incorrect.  See instructions and the Line 5 Worksheet.

https://www.irs.gov/pub/irs-pdf/i1040s8.pdf

MFS will start to phase out at a lower AGI threshold but the math starts with $3,600/$3,000.