If the 6 month old baby has some teeth and they are beginning to feed themselves then yes you can give the 6 month old baby a biscuit to eat.
The Biscuits are not that great or very nutritious for babies or even toddlers.
However once the baby or toddler is able to eat solids and has some teeth then they can eat the biscuits.
Just be sure to always supervise the baby or toddler while they are eating.
Always make sure the baby or toddler is seated and having them in a high chair strapped in while eating is also a good idea.
That way they cannot just get up and run around with food as they can easily choke.
If the 6 month old is not eating much solids or has not gotten enough teeth then they should not eat the biscuits.
Some babies are not ready to eat biscuits until 9 or 10 months of age and some babies are ready sooner.