Can I give Marie biscuits to my 9 months old son. Is it gud for him?

Maybe just to taste so he can feel the texture in the mouth but I would not recommend it as a regular snack. It is high in sugar and that is empty calories. There are a number of healthy and nutritious baby snacks in the market. Try Pigeon crackers or Baby Bite rusks. Look at the list ingredients thoroughly though and make sure the product you choose has less or no sugar and salt.