Ever wondered why babies put everything in their mouths? It's not just teething. From birth, the mouth plays a crucial role in sensory learning, helping babies explore, understand and connect with the world around them.
From around 4–6 months of age, babies begin putting everything they can get hold of into their mouths. While it can be frustrating, and often worrying for parents, this behaviour is a completely normal and important part of development.
The mouth is one of the most sensitive parts of a baby's body, containing thousands of nerve endings that provide detailed information about texture, temperature, shape and movement. Before babies can use their hands with precision, they often learn more about an object by mouthing it than by simply touching it.
Researchers describe this stage as oral exploration - babies use their mouths to gather sensory information and build an understanding of the world around them. By mouthing toys, fingers, food and other safe objects, babies learn about different materials and build the sensory foundations needed for feeding and communication. This is why mouthing peaks during infancy and gradually reduces as other sensory and motor skills become more developed.
The mouth also plays a central role in early motor development. Every suck, chew, bite and tongue movement helps babies strengthen and coordinate the muscles of the lips, tongue, cheeks and jaw. These movements are essential for feeding, drinking and, later, speech.
So what can look like simple play (or a deliberate attempt to get a tummy bug!) is actually a highly sophisticated process of sensory learning and skill development. We're not sure that makes it any less frustrating to manage - for you or your little one - but it's good to know!