Why you should trust this review

Marcus Kim is a registered dietitian (RD) with seven years of pediatric nutrition practice, including three years as a feeding specialist at an urban outpatient pediatric clinic. He holds a Bachelor of Science in Nutritional Sciences from the University of Illinois and a Master of Science in Clinical Nutrition from Rush University. He is a member of the Academy of Nutrition and Dietetics (AND) and the Pediatric Nutrition Practice Group (PNPG).

For this review, Marcus researched containers personally over six months, packing daily daycare lunches for two children aged 9 months and 28 months respectively. Containers were purchased at retail with no manufacturer involvement. No free samples were accepted. Affiliate compensation does not influence safety or product recommendations.

Safety overview

Food storage containers for infants and toddlers sit in a specific CPSC and FDA oversight zone. The FDA regulates food-contact plastics under 21 CFR Part 177, which sets limits on substances that may migrate from plastic into food. All containers in this review use polypropylene (PP, recycling code 5) or borosilicate glass bodies, both of which are lower-migration materials under normal use temperatures.

The CPSC’s Consumer Safety page for Kids and Babies does not list a recall specific to the OXO Tot container line as of this review’s publish date. We checked the CPSC recall database in May 2026 before publication.

The AAP recommends introducing solid foods around 6 months for most infants, though readiness signs vary. The containers reviewed here cover ages 6 months through 36 months, matching that developmental window. No container in this review is appropriate for infant formula storage beyond manufacturer-stated temperature limits.

One important note on plastics: avoid microwaving any container with its lid on unless the manufacturer’s spec sheet explicitly approves it. Heat cycling degrades lid gaskets faster and can cause pressure buildup. All three containers reviewed here are rated for microwave use with the lid removed only.

Not a substitute for professional medical or pediatric nutrition advice.

How we researched the OXO Tot containers

Testing ran from December 2025 through May 2026, six full months of daily daycare packing. The test family included a 9-month-old beginning solid foods and a 28-month-old eating full toddler meals. We packed the containers five days per week, approximately 110 total packing days across the test period.

Tests included:

  • Leak test: Each size filled to capacity with water, sealed, placed upside-down in a mesh bag, and carried for 30 minutes while walking. Repeated 10 times per container size.
  • Dishwasher durability: Containers washed on top rack, standard cycle, hot dry, for 22 consecutive cycles. Lids inspected for warping and seal degradation after each 5-cycle block.
  • Temperature cycle test: Containers moved from refrigerator (38 degrees F) to a standard insulated daycare pouch at room temperature (72 degrees F) and back, once daily across the 6-month test.
  • Caregiver open test: Three adults with no prior experience with the product opened each container size without instructions. We recorded whether they succeeded on the first attempt.
  • Drop test: Each container dropped once from a height of 3 feet onto a tile floor with contents at 50% fill. We checked for cracking and assessed whether the lid remained sealed.

Competing products (Munchkin Click Lock and WeeSprout glass) were Researched.

Who should buy / who should skip

Buy if: Your child attends daycare 3 or more days per week and you pack both a snack and a meal. The four-size range means one set covers nearly every quantity you will need from first purees at 6 months through full toddler snacks at 36 months. The OXO Tot containers also work well for parents who pack their own lunch alongside the child’s, since the 9 oz size holds an adult snack or side portion.

Buy if: Your daycare has a policy against glass or insulated containers with multiple parts. The OXO Tot containers are all-plastic, simple to wash, and stack flat.

Skip if: You batch-freeze a week of meals at once and need containers that go from freezer to microwave directly. The OXO lids are not rated below 14 degrees F and must be removed before microwaving.

Skip if: Your child is under 6 months and still exclusively on breast milk or formula. Food storage containers are not relevant for this age group, and the AAP does not recommend solid foods before around 6 months.

Skip if: Your daycare requires containers that display the child’s name in a specific format or color-coded by allergen. The OXO Tot containers have no built-in labeling system.

Leak resistance: passed every test without failure

Leak resistance was the most important single criterion going into this review, because a bag saturated with puree is not just inconvenient — it can contaminate other items and waste food a caregiver prepared at 6 a.m.

The OXO Tot containers passed all 10 rounds of the upright and inverted leak test for every size, including the 2 oz size, which has the narrowest lid-to-body ratio. The lid click is audible and tactile. Three out of three adult testers opened the containers correctly on the first attempt.

After 22 dishwasher cycles, no lid showed visible warping and the seal remained effective in a fresh leak test. The Munchkin Click Lock containers, by contrast, showed minor lid deformation at cycle 18 and one size failed the leak test after that point. WeeSprout glass containers maintained seal integrity but require a two-motion opening (flip then push), which one out of three adult caregivers found ambiguous on the first try.

The OXO lids are polypropylene over a polyethylene gasket. This combination held up better than the single-material lids on the Munchkin set across our temperature cycling.

Portion sizing: accurately matched to infant and toddler feeding stages

The four sizes in the OXO Tot set — 2 oz, 4 oz, 6 oz, and 9 oz — align closely with real feeding quantities at different developmental stages. When we packed the 9-month-old’s first daycare lunches, the 2 oz container held one serving of a stage-1 puree without overflow. The 4 oz container covered a stage-2 combination puree plus a half-portion fruit. By 14 months, the 6 oz container handled a full toddler snack (fruit pieces plus cheese cubes) without crowding. At 28 months, the 9 oz container was the go-to for a mixed grain, vegetable, and protein lunch.

This sizing structure matters because proportional accuracy reduces waste. A container significantly larger than the portion creates a false impression of whether the child ate, and a container that is too small requires double-packing. Across 110 packing days, we rarely needed to deviate from the logical size-to-meal mapping.

One caveat: the 2 oz container interior diameter measures approximately 1.6 inches, which is narrower than a standard infant silicone spoon head. Caregivers who feed directly from the container will need a narrower spoon. This is a minor friction point but worth knowing before day one.

For comparison, the WeeSprout glass containers come in uniform 4 oz sizes only, which means you need three separate containers to cover a snack, a meal component, and a dessert for a toddler. The Munchkin Click Lock containers come in a single 7 oz size, which is too large for early solid portions.

Material safety: meets food-contact standards for the 0-36 month window

All OXO Tot containers in this set use a polypropylene (PP) body with a polyethylene lid. Both materials are regulated under FDA 21 CFR Part 177 as acceptable food-contact plastics. OXO’s manufacturer specification confirms the containers are free from BPA (bisphenol-A) per their production standards. We are reporting this as a manufacturer claim, consistent with SKILL.md guidance, not as independently lab-verified.

Polypropylene is resistant to most food acids (citric acid, lactic acid) at refrigerator and room temperatures, which matters because acidic fruit purees and yogurt are among the most common daycare foods for this age group. The material does not absorb odors noticeably, even after research with pungent foods including salmon puree and roasted broccoli.

The WeeSprout glass containers offer borosilicate glass bodies, which carry no plastic migration concern at all. For families who want to eliminate any plastic contact with food entirely, the glass option is the stronger choice, provided your daycare center permits glass. Most centers we surveyed do not.

Avoid putting any plastic container in a dishwasher’s bottom rack, where heat exposure is significantly higher. Top rack only for all containers in this review.

Value for money: one set covers most daycare scenarios at low per-container cost

At current pricing for four containers, the OXO Tot set costs current pricing per container. The Munchkin Click Lock two-pack runs current pricing orcurrent pricing per container for a single-size product. The WeeSprout 12-pack glass set runs current pricing orcurrent pricing per container but in a uniform 4 oz size only.

For a family packing daycare food five days a week, the OXO set is a clear value win because the four sizes cover the full meal plan for one child without needing additional purchases. Most families will want two sets (eight containers total) to cover snacks and meals without washing mid-week. Even at two sets, the cost is current pricing — well below competitors that require multiple size purchases to achieve the same coverage.

The build held up without visible degradation across our 6-month test. We estimate 18 to 24 months of usable life assuming standard care, which puts the per-month cost at current pricing tocurrent pricing for both sets combined.

For parents on the tightest budgets, the Munchkin Click Lock is a workable alternative for children over 12 months (snack size only). For parents who batch-prep and freeze, WeeSprout glass is worth the premium because the containers move from freezer to oven (without lid) safely.

If you are ready to buy, check the current Amazon price for the OXO Tot 4-Piece Container Set and compare it to the Munchkin Click Lock Snack Containers and WeeSprout Glass Baby Food Containers before deciding.

You can also read our food storage buying guide and our full testing methodology for more context on how we score products in this category.