Dangers of Pre-Chewing Food for Babies: 3 Critical Health Risks

Premastication, the practice of an adult chewing food before feeding it to an infant, is an ancient evolutionary method practiced across various cultures. While some modern perspectives view it as a traditional way to transition infants from liquid diets to solid foods, medical professionals and researchers have raised significant concerns regarding the risks associated with this practice.

The practice involves another person pre-chewing foods or medicines, or using the method to pre-taste and temperature-test food for a child. However, the potential for harm, ranging from infection to fatal complications, has led to medical warnings against the habit.

Medical Risks and Safety Concerns

Research and clinical reports highlight several critical risks associated with premastication. One of the primary concerns is the transmission of infections from the adult to the infant via the oral route.

Beyond infection, other clinical risks include:

• The risk of dental caries.
• Choking hazards, particularly when introducing complementary foods.
• Potential for inadequate nutrition if premasticated foods replace balanced formula or breast milk.

In one clinical case, a 3-month-old female was found to be small for her age, with weight at the 3rd percentile, while being fed a combination of almond milk and premasticated foods such as pizza, chicken, and macaroni, and cheese. The infant was diagnosed as having inadequate nutrition, and the caregiver was counseled on the dangers of choking and the necessity of proper formula.

Hypothesized Benefits and the Microbiome

Despite the documented risks, some recent reviews have explored the potential biological benefits of premastication. These hypotheses center on the development of the child’s immune system and the oral microbiome.

Researchers suggest that premastication may expose infants to a healthy, balanced oral microbiome. This exposure, combined with the anti-inflammatory properties of saliva and the pre-digestion of food by salivary enzymes, is hypothesized to assist in the development of the immune system.

According to a review published in the journal Allergy, it is hypothesized that a more varied microbiome early in life could reduce the development of atopic diseases. The transfer of immune-stimulating, pre-digested soft food containing diverse food proteins may contribute to the development of oral tolerance during the critical period of microbial-driven immune system maturation.

The review notes that provided both the person chewing and the child are healthy, this method could potentially offer health-promoting effects, specifically regarding primary allergy prevention.

Current Scientific Standing

The scientific literature on premastication remains slim. While the hypothesis regarding the microbiome suggests potential benefits for allergy prevention, the majority of existing research continues to emphasize the risks of infection and other health complications.

Medical guidance generally prioritizes the avoidance of these risks, particularly the transmission of pathogens and the danger of choking, over the theoretical benefits of microbiome transfer.