If your baby is teething, you should get teething biscuits, e.g. Heinz, but not ordinary finger biscuits because ordinary biscuits break very easily. Once broken, it can be very dangerous...choking hazards. Teething biscuits are made for babies' teething needs. They don't contain sugar and may be enriched with calcium.
At least HK$15-29 per box. Each has 8-12pcs. It is more expensive than gerber or heinz. My son likes to eat japanese baby biscuit very much, so I buy for him.