Someone else can confirm, but I believe because you are MFJ, you have to file the I-864 (not the EZ) and the I-864A.
If you have your tax transcripts, use those. They prove not only were your taxes filed, but they were reviewed by the IRS. So, transcripts for 2022-2024. If you only have transcripts for 2022 & 2023 plus the 1040's and W2's for 2024, do that.
How old is your child?