Choosing the right bento box size, bib fit or bowl capacity sounds simple until you're standing in the feeding aisle with a hungry baby on your hip. This guide takes the guesswork out of sizing at every stage, from first solids to toddler lunchboxes.
Part of our complete guide to silicone baby feeding sets.
Bib Sizes: What Fits Each Stage
Silicone bibs are not one-size-fits-all. A bib that sits too low misses the mess. One that's too tight becomes a battle every mealtime.
4 to 9 months
Look for a neck opening of around 28 to 30 cm in circumference. The bib should sit high on the chest and cover the full front of a onesie. A deep front pocket catches purees and soft finger foods before they hit the lap. Adjustable snaps give you flexibility as your baby grows through this stage quickly.
9 to 18 months
Neck openings around 30 to 34 cm work well here. Your baby is moving more at mealtimes, so a wider bib body gives better coverage. Look for a pocket that's firm enough to hold its shape and catch chunky pieces, not just liquid.
18 months and up
Toddlers need a longer bib that covers their chest well. Neck openings of 34 cm or more suit this stage. Many parents switch to a sleeved smock bib at this point, especially once painting and messy craft gets added to the mix.
If you're unsure whether your bib size is right, check that two fingers fit comfortably between the neck strap and your child's skin. Too loose and it slips; too tight and it's uncomfortable.
Bowl Sizes: Matching Portions to Your Baby's Stage
A bowl that's too large can make tiny portions feel overwhelming for a new eater. Too small, and you're refilling constantly during toddler meals.
- 4 to 6 months (starting solids): A 150 to 200 ml bowl is plenty. Early solids are about exposure, not volume. Small portions, offered slowly.
- 6 to 12 months: Aim for a 200 to 300 ml capacity. Variety increases at this stage, so some parents use two small bowls to keep foods separate.
- 12 months and up: A 300 to 400 ml bowl suits a toddler's growing appetite. A suction base makes a big difference once your toddler starts pushing and grabbing at everything on the tray.
Silicone bowls with a suction base work best on smooth highchair trays and clean table surfaces. They don't grip as well on textured placemats, so pair them with a flat silicone placemat for the best result.
Bento Box Size Guide: Small, Medium or Large?
The right bento box size depends on your child's age, appetite and how you plan to use it. Here's a practical breakdown.
Small bento boxes (around 400 to 500 ml total capacity)
Best for toddlers aged 12 to 24 months. Small portions across two or three compartments suit little appetites without overwhelming them. Great for morning tea or a short outing snack pack. If you're looking for snack inspiration to fill these, our guide to toddler and baby bento snack ideas has practical, age-appropriate options.
Medium bento boxes (around 600 to 750 ml total capacity)
Suits children aged 2 to 4 years. Enough room for a balanced lunch with a protein, a vegetable and a fruit or snack section. This is the most popular size for daycare lunchboxes.
Large bento boxes (800 ml and above)
For children aged 4 and up, or for packing snacks for both a younger and older sibling in one box. Also works well for a mum packing her own lunch alongside the kids.
Four-compartment designs are especially useful for keeping foods separate, which matters a lot for toddlers who are particular about their food touching. Browse our silicone bento boxes with four compartments if organised, no-fuss lunches are what you're after.
For a deeper look at what makes a quality silicone lunchbox worth buying, our article on choosing a four-compartment bento box in Australia covers what to look for before you add to cart.
How to Keep Your Silicone Feeding Gear in Good Shape
Sizing is only part of the picture. Silicone bibs, bowls and bento boxes last much longer when they're cleaned and stored correctly. Residue build-up in bento compartments and bib pockets is common if they're not rinsed promptly after meals. Our full guide on cleaning silicone bowls, bento boxes and placemats walks through the best methods, including what to do about stubborn stains and odours.
Quick Reference: Size by Age
- 4 to 6 months: Small silicone bib, 150 to 200 ml bowl, no bento box needed yet.
- 6 to 12 months: Standard bib, 200 to 300 ml bowl, small bento for snack variety.
- 12 to 24 months: Toddler bib or smock, 300 to 400 ml bowl, small to medium bento box.
- 2 to 4 years: Smock bib for messy meals, medium bento box for daycare lunches.
- 4 years and up: Large bento box, standard bowl for home meals.
When in doubt, size up rather than down. Children grow fast and a slightly larger bib or bowl will still do the job, while a too-small bento box will be outgrown within a few months. Shop our range of four-compartment bento boxes to find the right fit for your child's current stage.
