Quick Answer
The research-supported answer is more times than most parents expect: between 10 and 15 exposures for a food that initially triggers refusal or avoidance, and sometimes more. This figure surprises most parents, who typically offer a new food two or three times before concluding that the child simply does not like it. The difference between a parent's tolerance for repeated refusal and the number of exposures the research identifies as necessary is one of the most important gaps to close in early feeding, because the decision to stop offering a food is the decision most likely to entrench the avoidance permanently. This article covers what the exposure research actually shows, what counts as an exposure, what each exposure should look like, and the conditions that make exposures effective rather than counterproductive.
What the Research Shows
The systematic study of food acceptance in infancy and early childhood, developed significantly through the work of researchers including Leann Birch at Penn State and later Lucy Cooke at University College London, consistently identifies repeated exposure as the single most reliable mechanism for increasing acceptance of new and initially refused foods in young children.
Birch's foundational research, published from the 1980s onward, demonstrated that children who received repeated taste exposures to an initially disliked vegetable showed significantly increased acceptance after 8 to 10 exposures, while children offered the same food fewer times showed minimal change. Subsequent research has refined this finding: the effective range is typically cited as 10 to 15 exposures, with some children and some foods requiring more. Importantly, the effect is cumulative and gradual rather than sudden: acceptance tends to increase incrementally across exposures rather than switching from rejection to acceptance at a single threshold point.
Lucy Cooke's research at UCL, including the CACTUS intervention for picky eating, extended these findings to show that the effect of repeated exposure is robust across different food types, different socioeconomic groups, and different child temperaments, including children whose parents describe them as very picky eaters. Repeated exposure works even when the child does not appear to enjoy the exposure: simple visual or tactile contact with a food, without eating, contributes to the familiarity increase that drives acceptance.
What Counts as an Exposure
This is where parent expectations most often diverge from what the research actually requires. An exposure does not mean the child eats the food. An exposure is any meaningful contact with the food:
- The food is present on the plate or tray and the child looks at it
- The child touches or handles the food without eating it
- The child smells the food
- The child puts the food in their mouth and spits it out
- The child takes a small taste
- The child eats a small amount
All of these are valid exposures that contribute to the familiarity accumulation the research identifies. A meal at which the baby handles a piece of broccoli, examines it carefully, and puts it back on the tray without tasting it is not a failed meal; it is an exposure. The adult eating broccoli at the same meal, with apparent enjoyment, is an additional social exposure. Both count.
What does not count as an exposure, in the sense that it does not produce the familiarity increase the research identifies, is a meal at which the food is absent. Deciding not to offer a food after two or three refusals removes all future exposure opportunity and freezes the acceptance level at wherever it is at that point.
What Each Exposure Should Look Like
The conditions under which exposures happen significantly influence their effectiveness. Research on the mechanisms of food acceptance identifies several conditions that support the exposure effect and several that undermine it:
Conditions That Support the Exposure Effect
- No pressure to eat. Pressure applied during an exposure (encouraging, bribing, cajoling, or insisting the child try the food) is consistently associated with reduced acceptance in the medium term. The child who is pressured to eat a food develops a negative association with that food that competes with the familiarity increase the exposure would otherwise produce. The adult's role during an exposure is to provide the food and eat it themselves; what the child does with it is the child's decision
- Social modelling. Shared meals at which a trusted adult eats the target food with apparent enjoyment produce a social safety signal that compounds the familiarity effect. The child who sees a parent eat broccoli with visible pleasure receives both a sensory exposure and a social endorsement in the same meal. Research shows that social modelling accelerates the exposure effect, meaning fewer exposures are needed to reach acceptance when modelling is present than when the child encounters the food alone
- Positive or neutral mealtime atmosphere. Exposures that happen in an anxious, tense, or conflict-charged mealtime atmosphere are less effective than those that happen in a relaxed, pleasant context. This is partly because stress at mealtimes becomes associated with the food itself (the child learns that this food produces a difficult mealtime) and partly because caregiver anxiety is readable by young children and signals that the food is a source of concern rather than a routine part of eating
- Variety of preparations. Offering the same food in different preparations across exposures increases the total sensory information the child accumulates and may hit the acceptance threshold sooner than a single repeated presentation. A food that is refused roasted may be accepted steamed, or vice versa; a food refused as a puree may be accepted as a soft finger food
Conditions That Undermine the Exposure Effect
- Pressure, bribery, or reward for eating. Offering a reward for eating a disliked food (dessert if you eat your vegetables) reduces intrinsic motivation to eat the food and increases the perceived undesirability of the vegetable relative to the reward. This is one of the most reliably counterproductive feeding strategies in the research literature
- Hiding the food. Concealing vegetables or disliked foods in other foods (blending spinach into a smoothie, hiding vegetables in a sauce) does not produce exposure to the food in a form the child can recognise and accumulate familiarity with. It may increase vegetable intake in the short term, but it does not change the child's relationship with that food and does not contribute to the exposures needed for acceptance of the food in its recognisable form
- Emotional reactions to refusal. A visible caregiver reaction to refusal (frustration, disappointment, or repeated encouragement) makes refusal more behaviourally interesting and reinforces its function as a way of eliciting a predictable adult response. A neutral, matter-of-fact response to refusal (the food remains on the tray, the meal continues, no comment is made) removes this reinforcement
Practical Application
- Track exposures rather than acceptances. Counting meals at which a target food was present and the child had contact with it (rather than counting the meals at which the child ate it) reframes the metric in a way that makes patience easier. Ten exposures at weekly mealtimes takes ten weeks; ten exposures at twice-weekly mealtimes takes five weeks. Either is reasonable and expected
- Keep portions small. A large serving of a refused food on the plate is more aversive than a single piece or small portion. One piece of broccoli on a tray alongside accepted foods is a low-stakes exposure; a full serving of broccoli beside nothing else is a high-stakes demand. Small portions reduce the social pressure of the exposure
- Serve new foods at the beginning of the meal. Appetite is highest at the start of a meal. A new or refused food offered when the child is hungry has a better chance of at least being touched or tasted than the same food offered at the end of a meal when appetite has been satisfied by preferred foods
- Be consistent about continuing to offer. The exposure effect requires the food to keep appearing. A food that is removed from the rotation after refusal does not benefit from the cumulative familiarity effect. Decide on a target food or set of target foods and offer them regularly, regardless of how each individual meal goes
Key Takeaway
Offer new or refused foods 10 to 15 times, or more if needed, before drawing any conclusions about whether the child will accept them. An exposure is any meaningful contact with the food, including looking at it, touching it, or mouthing and spitting it out: the child does not need to eat the food for the exposure to count. The conditions that make exposures effective are: no pressure, social modelling by the adult eating the same food, a relaxed mealtime atmosphere, and variety of preparations across exposures. The conditions that undermine the effect are: pressure, bribery, hiding the food, and emotional reactions to refusal. Keep portions small, offer new foods at the start of the meal when appetite is highest, and track exposures rather than acceptances to maintain patience across the timeline the research identifies as necessary.
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This article is for informational purposes only and is not a substitute for professional advice. If you have concerns about your child's food acceptance, sensory responses to food, or growth, consult your pediatrician or a registered feeding specialist.