Mouthing In Babies: Why They Do And When To Stop It

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Grimacing or mouthing in babies is defined as a contact of an object with the baby’s lips, tongue, or mouth (1). According to experts, it is a common behavior that a baby exhibits during infancy by putting everything in their mouths. Be it their hands, a toy, blanket, or teether, babies fiddle with things and then put them in their mouths. But why do babies grimace? Does grimacing indicate any underlying problem? Keep reading to learn about the mouthing phase in babies and the possible risks that mouthing everything can raise.

Why Do Babies Put Everything In Their Mouths?

Once babies develop a grip and can hold things, they try to put everything in their mouths to determine the texture, shape, and taste of the item. Babies are born with certain reflexes. A reflex is a muscle reaction that happens automatically in response to stimulation. Certain sensations or movements produce specific muscle responses (2). The common reflexes related to mouthing are:

  • Rooting reflex: This reflex is seen when the baby’s cheek is stroked. The infant turns towards the side where he/she was stroked and exhibits sucking actions.
  • Suck reflex: The baby makes a sucking motion when the area around the mouth is touched.

    Suck reflex in babies

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Rooting and sucking reflexes are a natural phenomenon that causes the baby to put everything in their mouth during infancy.

There are some other attributes of mouthing in babies.

  • It is believed that mouthing is a natural phenomenon that exercises the mouth’s muscles, thus making them strong for essential actions like eating and speaking. By mouthing, the babies learn to establish a harmonious movement between the lips, tongue, jaws, and cheeks.
  • During the teething phase, babies are seen to put things in their mouths to soothe the sore and irritated gums (3).
  • Some people believe that putting everything in their mouths helps develop a baby’s immunity by exposing them to various microorganisms.
  • It is also believed that mouthing makes the baby habituated to the feeling of a solid substance in their mouth. It might help in a smooth transition to solid foods.

Do All Babies Put Things In Their Mouths?

Most babies put objects in their mouth

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Most babies have the tendency to place an object in their mouth. The habit is often present at some point during infancy. Most babies outgrow the habit or stop placing specific objects in the mouth as they grow a little older. It is noticed that babies use pacifiers for a longer duration than other objects to put in their mouths (4).

Why Do Babies Put Their Feet In Their Mouths?

Babies put feet in their mouth

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Babies place feet in their mouth for the same reasons as they put mouth their hands. As babies begin to grow, they develop better control and strength and thus are able to lift their legs and grab them with their hands. The flexibility of a baby’s body allows the feet to reach the mouth easily.

Mouthing helps the little one explore their feet with their mouths. For non-mobile babies, holding toes is like having a toy that is never far away. For some babies, sucking on to the toes might also help soothe them.

When Do Babies Stop Putting Things In Their Mouths?

Usually, babies stop putting things in their mouths by the age of three years. But in some cases, the habit may go beyond four years. They might also develop a habit of finger or thumb-sucking. Babies with mouthing habits beyond four years of age might need some corrective measures or habit-breaking appliances (5).

What Are The Possible Risks Of Babies Putting Things In Their Mouth?

Although the habit of mouthing in itself is not harmful, it might bring some possible risks along for the babies.

1. Infections

Mouthing can lead to infections in babies

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Babies with a habit of mouthing might put anything and everything in their mouth. It becomes even more difficult to monitor them when they begin to crawl. It exposes the baby to contaminated objects, which increases the risk of bacterial or viral infections. Keep the floor and toys of the baby clean to avoid infections. Keep the baby’s toys separate from their siblings’ to prevent the transfer of pathogens.

2. Choking

Choking is a potential hazard for babies who have a habit of mouthing. It is good to store small items away to prevent the baby from mouthing the objects. Provide toys that are not a choking hazard or have no sharp edges that could hurt the baby.

Avoid giving food items that may choke the baby. Some people say that anything of a size that can pass through the ring of a toilet paper tube is not safe for babies. Bead necklaces or bead bracelets are also risky and a potential life hazard (6).

Safety Precautions To Take During The Mouthing Phase

Clean and disinfected toys help prevent infections in babies

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You may take the following precautions to protect your baby from the potential risks of mouthing.

  • Keep your baby under adult supervision so that they do not put harmful things in their mouth, especially outdoors.
  • Clean all the toys and objects that the baby is likely to put in their mouth. Disinfecting the toys might help prevent infection in babies.
  • Positive reinforcement can play a major role in weaning the baby off the habit. If your baby tends to mouth random objects, then substitute the harmful things with child-safe products and finger foods such as carrot and potato, if the baby is older than ten months.
  • For verbal and older babies, encourage them to understand the meaning of “no.” Gently say no to them when they are putting things in their mouths.
  • Teethers are a good choice for babies who are undergoing teething. Chewing on these toys will keep the baby at ease and prevent them from putting harmful things in their mouth.
  • Pacifiers might help in keeping the babies calm while they are in the mouthing phase. Use small loops to attach the pacifier to the baby’s sleeve so that they do not drop it frequently and contaminate it. Avoid hanging the pacifier to the baby’s neck to prevent strangulation.
  • Keep all liquids and cosmetics like shampoo, phenyl, detergent, lipsticks, etc., away from the baby’s reach to avoid any poisonous ingestion.
  • Keep the first aid box and the medicines away from the baby to avoid accidental ingestion of medicines.

Mouthing in babies is a common and natural behavior that should not cause any concern as it would likely go away after they reach a certain age. Babies tend to often put things in their mouth during the teething phase or as part of their reflex. However, during mouthing in babies, you need to be careful about what they put in their mouths to prevent them from choking and contracting an infection. So encourage them to use a pacifier or teether and follow the precautionary tips to ensure your baby’s safety.


MomJunction's articles are written after analyzing the research works of expert authors and institutions. Our references consist of resources established by authorities in their respective fields. You can learn more about the authenticity of the information we present in our editorial policy.
1. Mary K. Fagan and Jana M. Iverson, The Influence of Mouthing on Infant Vocalization; U.S. National Library of Medicine
2. Infant reflexes; U.S. National Library of Medicine
3. Symptoms Associated With Infant Teething: A Prospective Study; OFFICIAL JOURNAL OF THE AMERICAN ACADEMY OF PEDIATRICS
4. An Observational Study of Object Mouthing Behavior by Young Children; OFFICIAL JOURNAL OF THE AMERICAN ACADEMY OF PEDIATRICS
5. Orlando Tanaka et al, Breaking the Thumb Sucking Habit: When Compliance Is Essential; The Journal Of Case Reports In Dentistry
6. Farah Abdulsatar et al, Teething necklaces and bracelets pose significant danger to infants and toddlers; Oxford Academic Paediatrics & Child Health
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Dr. Ritika Shah

Dr. Ritika Shah is a certified lactation counsellor (CLC) from iNational Health Care Academy, Singapore and a dental surgeon with more than seven years of clinical experience across various cities in India. She did her graduation in Dentistry from KM Shah Dental College. During her clinical practice, pediatric dentistry was her particular area of interest, and she constantly thrived to...
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Dr. Umera Zakiahmed Saiyed

Dr. Umera Zakiahmed Saiyed is a homoeopathic consultant and runs her own clinic Noor. She pursued her BHMS from Yerela Medical College in Kharghar, Mumbai and worked as an assistant doctor under a gynaecologist in Surat, Gujarat. With more than 5 years of experience in gyneacpcods, assisting many labor and caesarean deliveries, she holds expertise in cases related to infertility,...
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