Does Baby Sucking Ability Lead To Obesity?

Years ago, Successful Black Parenting Magazine asked whether the way a baby sucks during feeding might offer an early clue about future weight gain. The research was preliminary then. Nearly a decade later, scientists, including the researcher we originally interviewed, know considerably more about infant appetite, responsive feeding, and healthy growth.

Originally by Janice Robinson-Celeste
Updated by Successful Black Parenting Magazine

Can the Way a Baby Sucks Really Tell Us Something About Future Weight?

When Successful Black Parenting Magazine originally interviewed Dr. Babette S. Zemel of Children’s Hospital of Philadelphia, she and her colleagues were studying a fascinating question: Could the way a baby sucks during feeding help researchers identify infants who might gain weight more rapidly?

At the time, the answer was far from certain.

The research involved healthy African American infants during the first two years of life. Investigators were looking at sucking behavior alongside many other possible influences on growth, including feeding practices, maternal health, diet, and weight.

The early findings suggested that infants with stronger sucking patterns gained weight more rapidly during early infancy.

That finding generated an obvious question for parents. If a baby gains weight quickly during those adorable, round-cheeked months, should a parent worry about childhood obesity?

Dr. Zemel’s answer was appropriately cautious then, and it remains an important message now.

A. Dr. Zemel explained that the original findings came from a preliminary analysis of an ongoing study. Previous research had already found an association between rapid weight gain during early infancy and later obesity, but the purpose of her research was to understand why some babies gain rapidly and why only some of those children later develop obesity.

Infant sucking behavior was only one of many factors being examined.

She emphasized an especially important point: not every infant who gains weight rapidly will later develop obesity.

— Dr. Babette S. Zemel, Children’s Hospital of Philadelphia, from the original Successful Black Parenting Magazine interview

Now We Know More About the Babies Dr. Zemel Was Studying

The story did not end with that preliminary research.

In 2025, Dr. Zemel and colleagues published newer research examining appetite-related characteristics and growth in 222 African American infants and toddlers through 24 months of age.

The researchers looked at characteristics such as general appetite, responsiveness to food, how slowly infants ate, enjoyment of food, and responsiveness to feeling full.

They found that several appetite-related characteristics measured during infancy were associated with later growth and body fat measures at 24 months.

Importantly, some of those associations remained even after researchers accounted for the child’s earlier body size and the mother’s obesity status.

That does not mean researchers can watch a newborn feed and predict that child’s future weight.

It means something more interesting and scientifically responsible: differences in appetite can begin very early in life, and those differences may be one part of how children’s individual growth patterns develop.

A Vigorous Feeder Is Not Automatically an Overfed Baby

Parents can easily become anxious when their baby seems to eat more enthusiastically than another baby.

One infant may slowly work through a bottle while another finishes quickly and appears ready for more. One breastfeeding baby may nurse for longer periods, while another feeds efficiently in a much shorter time.

Those differences alone do not tell parents that something is wrong.

A 2023 study of 114 healthy infants identified three different sucking profiles researchers described as vigorous, capable, and leisurely. Infants in the vigorous group gained more weight between 4 and 12 months than infants in the leisurely group.

Researchers concluded that sucking characteristics might eventually help identify infants with different growth patterns, but they also emphasized that more research is needed.

That distinction is critical.

A research association is not a diagnosis.

Parents should not attempt to slow a baby’s growth or restrict breast milk or formula because their baby seems enthusiastic about feeding.

Healthy infant growth is evaluated using repeated measurements over time, including weight and length, alongside the baby’s medical history, feeding, development, and overall health.

What Does Rapid Infant Weight Gain Actually Mean?

Scientists have studied rapid infant growth for decades because children who gain weight very rapidly during infancy are, as a group, more likely to experience overweight or obesity later.

That does not make rapid infant weight gain a diagnosis of future obesity.

Babies grow at remarkably different rates. Some babies experience catch-up growth after being born small. Genetics strongly influence body size. Feeding method, gestational age, birth weight, maternal health, sleep, illness, medications, and numerous environmental factors can affect growth.

The pattern matters more than a parent’s impression that a baby looks “too chunky.”

Healthy babies are supposed to gain weight.

Baby rolls are not a medical diagnosis.

The appropriate response to concerns about rapid growth is not to put an infant on a diet. Parents should bring the concern to the child’s pediatric healthcare professional, who can review the baby’s growth pattern over time.

Responsive Feeding Matters More Than Counting Every Ounce

One of the most useful developments in infant nutrition guidance is greater emphasis on responsive feeding.

Responsive feeding means parents provide appropriate food and milk while paying attention to the baby’s signals about hunger and fullness.

According to the Centers for Disease Control and Prevention, young babies may show hunger by bringing their hands to their mouths, turning toward the breast or bottle, puckering or licking their lips, or clenching their hands.

Fullness has signals too.

A baby may close their mouth, turn away from the breast or bottle, or relax their hands.

Those cues matter because feeding is a relationship between the caregiver and child.

The parent’s responsibility is to offer appropriate nourishment. The baby’s signals help communicate when they need more and when they have had enough.

This idea is remarkably close to something Dr. Zemel told Successful Black Parenting years ago.

She suggested that future interventions might include teaching parents how to distinguish hunger from a desire for comfort and allowing babies to take small breaks while drinking from a bottle.

Current feeding guidance has moved strongly in that direction.

Please Do Not Put Cereal in a Baby’s Bottle to Make Them Sleep

The original version of this article asked Dr. Zemel about the practice of adding powdered cereal to bottles.

We are updating that section because current guidance is much clearer.

The CDC advises parents not to put infant cereal or other solid foods into a baby’s bottle unless a healthcare professional has recommended a specific feeding modification for a medical reason.

Adding cereal does not make a baby sleep longer.

It can, however, increase the risk of choking.

The CDC also recommends that bottles contain only breast milk or infant formula under ordinary circumstances.

Complementary foods are generally introduced around 6 months of age when a baby shows developmental readiness, including the ability to control their head and neck, sit with support, open their mouth when food is offered, and swallow food rather than automatically pushing it back out.

Parents who have been instructed to thicken feeds because of reflux, swallowing problems, or another medical condition should follow the individualized instructions of their child’s healthcare team rather than general internet feeding advice.

What About Genetics and the Parents’ Weight?

During the original interview, Dr. Zemel was also investigating whether maternal diet during pregnancy, pregnancy weight gain, heredity, and family eating patterns influenced a child’s growth.

We now understand even more clearly that childhood obesity is complex.

No single behavior explains why one child develops obesity while another does not.

Genetics can influence appetite, metabolism, body composition, and susceptibility to weight gain. A child’s environment also matters, including access to nutritious food, neighborhood opportunities for safe physical activity, sleep, stress, family routines, socioeconomic conditions, and exposure to highly processed foods.

Parents’ health can be relevant without turning parental weight into blame.

That distinction matters particularly in conversations about Black families, because racial disparities in obesity do not exist in a vacuum.

The CDC reports that about one in five U.S. children and adolescents ages 2 through 19 has obesity. In the 2017 through March 2020 national data, obesity prevalence was 24.8% among non-Hispanic Black children compared with 16.6% among non-Hispanic White children.

Those differences reflect an interaction of biological, social, economic, environmental, and structural factors. They should not be reduced to stereotypes about what Black parents feed their children.

Do Not Put a Baby on a Diet Because of Obesity Statistics

Population statistics can help researchers understand health disparities, but they should not create anxiety about an individual infant’s body.

Babies need calories and nutrients for extraordinarily rapid brain and physical development.

Restricting an infant’s breast milk or formula without medical supervision can interfere with growth and nutrition.

Parents should also be careful about beginning weight-focused language around children from infancy. A baby is not “good” because they are small, nor are they unhealthy simply because they have a larger body.

The healthier focus is growth, development, nutrition, responsive feeding, sleep, movement as children become mobile, and a positive relationship with food.

As children grow, parents can continue building those habits without making weight the center of family life. For practical ideas, see Healthy Habits Parents Can Teach Children From an Early Age and Empowering Healthy Food Choices for Kids in African American Communities.

Breastfeeding, Pumping, Formula Feeding, and Combination Feeding Can All Require Learning

The original research should not be interpreted as saying one feeding method automatically produces a healthier-weight child than another.

Families feed babies in different ways for many reasons.

Some infants breastfeed directly. Some receive expressed human milk. Some receive formula. Some families combination feed. Medical conditions, milk supply, work schedules, medications, access to lactation support, parental choice, adoption, prematurity, and many other circumstances can influence how a baby is fed.

What matters is that feeding is nutritionally appropriate, safe, and responsive to the individual baby’s needs.

Parents who breastfeed or pump and want more guidance on reading feeding cues can also read How Often Should I Pump and Breastfeed? A Quick Guide for New Moms.

If feeding is consistently stressful, painful, unusually prolonged, associated with coughing or choking, or your baby is struggling to gain appropriately, contact the child’s pediatrician or another qualified feeding professional rather than assuming the problem is appetite.

Can Parents Tell Whether Their Baby Has an Especially Strong Sucking Pattern?

In the original study, researchers used a specialized device called the Neonur to measure sucking pressure and sucking activity during bottle feeding.

This was a research tool, not a test parents could buy and use at home.

Parents may certainly notice that one baby drinks quickly and another drinks slowly, but there is still no reason for families to measure sucking strength as an obesity screening tool.

Research published in 2023 found that sucking patterns could be categorized and were associated with differences in subsequent weight gain, but researchers described these patterns as potential tools for future investigation rather than something parents should use to predict their children’s weight.

The most useful information for a parent remains much simpler: watch your baby’s feeding cues, attend well-child visits, and allow the healthcare team to monitor the child’s growth trajectory.

What Parents Should Watch Instead of Sucking Strength

Parents do not need specialized equipment to support healthy infant feeding. The everyday signs that matter most are whether the baby is feeding comfortably, producing an appropriate number of wet and dirty diapers for their age, growing consistently, developing normally, and showing understandable hunger and fullness cues.

A pediatric healthcare professional should evaluate concerns such as poor weight gain, an unexpected change in the baby’s established growth pattern, persistent vomiting, repeated choking or coughing during feeding, difficulty coordinating sucking and swallowing, extreme sleepiness during feeds, or other feeding difficulties.

The goal is not to make every baby follow the same growth curve.

The goal is to make sure each child is growing appropriately for that child.

The Bottom Line: The Research Became More Interesting, Not More Frightening

When Successful Black Parenting first interviewed Dr. Zemel, the question sounded provocative: Could a baby’s strong sucking behavior become an early warning sign for childhood obesity?

Nearly a decade of additional research has given us a more nuanced answer.

There does appear to be a relationship between early appetite characteristics, feeding behavior, rapid infant growth, and later body size. Dr. Zemel’s newer research in African American infants and toddlers adds important evidence that appetite-related traits measured in infancy can be associated with growth and adiposity at age two.

But no single sucking pattern tells us what a child’s future body will look like.

A strong feeder is not automatically an overweight toddler.

A round baby is not automatically an unhealthy baby.

And parents should not respond to concerns about childhood obesity by restricting an infant’s nutrition.

What parents can do is considerably more practical. Learn your baby’s hunger and fullness cues. Feed responsively. Avoid putting cereal or other solids into bottles without medical direction. Introduce complementary foods when your baby is developmentally ready. Keep well-child appointments. Ask questions when growth changes unexpectedly.

Most importantly, treat feeding as nourishment and connection rather than the beginning of a lifelong battle over body size.

This article is for educational purposes and is not a substitute for individualized feeding, nutrition, or medical guidance from your child’s pediatric healthcare professional.