Is it a norm for a 8 month old baby to put toys into their mouth? I read that that is how baby senses n explore the things around them. Their mouth is like their senses . Is it true? Cos my baby will be gg to infant care this fri and I worry that by putting toys etc into his mouth , he will fall sick easily. How to prevent him from putting toys into his mouth ?

Yes, it's definitely normal for them to put everything in their mouth as they are exploring. Don't think putting toy into the mouth is the major cause if they fall sick. Younger toddlers tend to fall sick easier as compared to older kids. Perhaps you wana consult pd/gp if there's any multi-vits for 8months to build their immune system; Off-the-rack multi-vits usually not suitable for 2yo or younger.