I based the rewrite on the story text you provided.

“Why aren’t you driving the Cadillac I gave you?”

The voice cut through the winter air like a blade.

I froze on the sidewalk, one hand gripping the handlebar of an old bicycle with a flat front tire, the other pressed protectively against my baby carrier. My son, Noah, was strapped to my chest, bundled in layers, his tiny face half-hidden against me. The formula at home was nearly gone. That was the only reason I had forced myself outside in the cold.