Without commenting on much else, I am almost falling over myself to say that yes, babies CAN choke on bread.
Babies can choke on ANYTHING.
My DD choked on a soft biscuit when she was the same age as the OP's bub, and I was right there in front of her, watching her. That is the only reason she is still alive.
And when *I* was about the same age, too, I choked. On a piece of bread. My mother has had a choking phobia ever since.
Nobody should ever EVER be complacent about choking risks. And I'm not talking a little gagging and couging. When it's the real thing, it's quick, it's silent, and it's lethal.
Aaaaand back to your regular programming...