B.M.
I too believe that the teething biscuits are not safe...not yet. And if you were to use them, put them in the mesh feeder...they all crumble. I think we only bought one box of them as well.
Since he's too young to hold the feeder, stick with things he can handle...like the puffs.
When my kids were than age, we did small pieces of banana rolled in crushed up cheerios (because the bananas alone were sometimes difficult for those little fingers to pick up).
Cheerios (or the like) are a good "first food" as well.
Good luck.