L.A.
I waited with the zweiback too, but I started my son on sodium free saltine crackers, b/c they ae easy to hold, don't break up into chokable chunks and dissolve into his mouth too.
I was worried about using the puffs b/c they looked like choking hazards, but I suppose they are fine since they dissolve.
I never did like the biter biscuits b/c they were so hard and very messy.