Comotomo vs Nanobebe Flexy: which silicone bottle should you buy?

Side by side

One row in that table is worth more than the rest put together, and it is the third one. Flow rate is the variable behind most of what parents blame on a bottle: gulping, coughing, pulling off, swallowing air, draining 4 oz in four minutes, or tiring out before the bottle is finished. A bottle you can move up and down the flow range is a bottle that can follow your baby. The signs that mean move up, and the ones that mean move down, are in bottle nipple flow sizes.

Flow range: the Nanobebe's real advantage

Nanobebe publishes the thing almost nobody in this category publishes: actual flow rates per level. Its Flexy specification lists five nipples — preemie at 13 ml/min, slow at 24 ml/min for newborn to three months, medium at 38 ml/min for three to six months, fast at 60 ml/min for six months and up, and a Y-cut — and ships the slow flow in the box.

Two things follow. First, you can change one variable at a time: if feeds are going badly you can step the flow without changing bottle system, which is the cheapest useful experiment in bottle feeding. Second, the published numbers let you compare levels honestly rather than trusting a label, because flow-level names are not standardized between brands — one company's "medium" is another's "slow".

The preemie level is the one that occasionally matters enormously. A baby who tires before they are full needs a slower flow, not a faster one, and 13 ml/min is genuinely slow. If that is your situation, read best bottles for preemies before you buy anything, because flow rate rather than brand is the whole decision there.

Honest cons: the Flexy's taller, slimmer silicone body is floppier to fill than a rigid bottle — you will want to stand it in something while you pour — and a 9 oz soft bottle is unwieldy for a newborn taking 2 oz. The three-vent nipple is also a little more to rinse than a plain one.

Cleaning: the Comotomo's real advantage

The Comotomo's opening is wide — wide enough to get a hand inside, which means no bottle brush can miss a spot and you are not fighting a narrow neck at 6am. It is three parts, it is dishwasher safe on the top rack, and there is no internal vent tube to lose. Over a year of several feeds a day, that is a real quality-of-life difference and the main reason people who like Comotomo like it a lot.

Honest cons: the flow range is short and the rates are not published, so if your baby needs something other than the slow or medium nipple your options run out quickly. The wide squat shape does not fit every bottle warmer well — worth checking against our warmer picks if you own one — and like all soft silicone bottles it is easy to knock over, because there is nothing rigid to stand on.

On hygiene, follow CDC guidance on cleaning, sanitizing and storing feeding items for either bottle: clean after every use, and sanitize daily only if your baby is under two months old, was born prematurely, or has a weakened immune system. You may need less equipment than you think — do I need a bottle sterilizer.

And if you are washing a full set of these every day, the machine question comes up — Baby Brezza vs Papablic bottle washer is honest about who needs one.

Will either one be accepted? Honestly, nobody can tell you

Both are sold on feeling breast-like, and both have a fair claim to it: soft silicone that gives under compression is closer to the real thing than rigid polypropylene. But acceptance is not predictable. Babies have specific and unreasonable opinions about nipples, and the bottle that works for your friend's baby means nothing for yours.

Which is why the standing advice on this site is the same here: buy one, not a set. One Comotomo and one Flexy costs less than a six-pack of the wrong bottle, and it answers the only question that matters. If you are introducing a bottle to a breastfed baby, technique moves the needle more than the product does — how to introduce a bottle and paced bottle feeding are the two pages to read first, and best bottles for breastfed babies is the wider shortlist. If your baby is refusing every bottle you own, that is its own problem: why won't my baby take a bottle.

Venting and gas, without overclaiming

Comotomo states dual anti-colic vents; Nanobebe states a three-vent, non-collapsible nipple. Venting does a real job — it lets air into the bottle instead of into the baby — and a non-collapsible nipple is a meaningful claim, because a nipple that flattens under suction interrupts the feed and makes a baby gulp when it pops back.

What neither one does is treat anything. Spitting up is extremely common and usually not a problem to be solved: the AAP's guidance on why babies spit up is worth reading before you buy a third bottle, and persistent crying, poor weight gain or arching mid-feed belong with your pediatrician rather than with a shopping decision. Our fuller treatment is in best anti-colic bottles and best bottles for reflux.

The verdict

Buy the Nanobebe Flexy if you want room to move: five published flow levels including a 13 ml/min preemie flow, a non-collapsible three-vent nipple, up to 9 oz of capacity and stated microwave safety. It is the more adaptable of the two and the better default if you are not yet sure how your baby feeds.

Buy the Comotomo if your baby is happy on a slow or medium flow and you want the bottle that is least annoying to own: a hand-width opening, three parts, nothing to lose. It is the better bottle for the person doing the washing up.

Buy neither if nobody has told you that silicone bottles tip over, do not stand reliably on a drying rack, and cost more than a conventional bottle that feeds a baby just as well. The Philips Avent Natural Response is the unexciting answer that suits most babies, and there is no shame in it — the best baby bottles ranks the field, and glass vs plastic baby bottles covers the material question if that is what is actually on your mind.

How we chose

Researched, not hands-on. Sizes, nipple flows, flow rates in ml/min, venting and dishwasher and microwave claims are quoted from the makers' own pages — Nanobebe's Flexy specification and Comotomo's own range — both checked on 8 October 2026, with both bottles confirmed on sale that day. Where Comotomo publishes no per-level flow rate, the table says so rather than inventing one. Independent hands-on testing of the bottle category comes from Mommyhood101, and the spit-up and reflux framing from the AAP. On this page flow-range breadth and cleaning are weighted heaviest, and "feels like the breast" is weighted down, because acceptance is not predictable from a specification. Rubric: how we choose.