Capital expenditures rebounded very strongly and it's a compressed estimate. Consumers were a bit rattled b/c of Chick Little Syndrome.
But it was a strong Q.
Real GDP increased by 2.9% in 2018 when measured from the 2017 annual level to the 2018 annual level.
Measured from Q4 2017 to Q4 2018, real GDP gained 3.1%,
Consumers got a bit jittery, yes.
But don't be shocked to see a revision that brings the 2017 - 2018 annual rate > 3%, near the Q4 2017 - Q4 2018 at 3.1%.