I just remembered that OP noted in a different thread that OP's child was placed in 1st grade for reading and math this past school year, immediately after kindergarten screening and placement measures--so the teacher's recommendation to skip 1st grade is based presumably on his performance in an actual first grade academic setting this year, including social interactions with the same likely set of peers that would be in the receiving 2nd grade classroom in the event of a skip. That lowers the risk of negative social consequences considerably, as he has functionally been in a split K/1st placement this year anyway, and actually makes not skipping more like a retention (unless the school continues to SSA reading and math to form a 1st/2nd split next year).
If OP comes back to this thread, one hopes this discussion will be helpful to her.
