Convertible carseat ?

RS

My little guy is on the taller side. He is 100 percentile on height scale (27.5 inch) in his 4th month checkup. Carseat height recommendation is till 32 inches. I’m sure he’ll outgrow from his carseat very soon. Anyone using convertible carseat? Any recommendations?

And also which stroller to use because he can’t sit yet so I cannot use my regular one without carseat.

Very confusing! Please help ladies.