Every bottle on the shelf claims to reduce colic, feel "closer to natural," or make feeding easier — most of that comes down to three genuinely different specs: material, teat shape, and size. The rest is largely branding.

Step 1. Glass and Plastic Are Both Safe — the Difference Is Weight and Durability

All baby bottles sold in the UK, glass or plastic, meet the same safety standards for what touches milk or formula — this isn't a safety comparison. Glass, like the BIBS or Tommee Tippee glass ranges, is heavier and doesn't scratch or cloud with use the way plastic can over time, but it's also more breakable and adds noticeable weight for a newborn's small hands once they start holding it themselves.

Neither material is the "better" choice universally — it's a genuine trade-off between durability/weight and breakage risk, worth deciding based on how the bottle will actually be used (a bottle a baby will eventually self-hold vs one that stays parent-held throughout).

Step 2. Teat Flow Rate Matters More Than Bottle Brand — See Our Full Feeding Guide

The single most decision-relevant spec on any bottle isn't the brand, it's the teat's flow rate, which needs to match how a baby actually feeds rather than their age alone. A baby who gulps, chokes slightly, or pulls off frequently may be on too fast a teat; one who falls asleep from effort may be on one too slow.

This is covered in full in our baby feeding guide, but it's worth repeating here specifically because it matters more than any other bottle spec — a "grow and flow" set with multiple teat stages, like the MAM Easy Start sets, exists precisely so you're not locked into guessing the right flow rate once.

Step 3. Anti-Colic Venting Systems Genuinely Reduce Air Intake — but Aren't All Equal

Anti-colic bottles use a valve or vent system specifically to let air bypass the milk rather than being swallowed with it, which can genuinely reduce gassiness and spit-up for some babies. The Tommee Tippee Natural Start and MAM Easy Start ranges both build their designs around this mechanism, though how much it helps varies by baby — it's a real feature, not purely marketing, but it isn't a guaranteed fix for every case of fussiness.

Worth trying if gassiness or frequent spit-up is a real issue, without expecting it to solve feeding problems that have other causes — see Step 3 of our feeding guide for when spit-up is normal versus worth mentioning to a health visitor.

Step 4. Wide-Neck vs Standard-Neck Is About Cleaning Ease, Not Feeding Quality

Wide-neck bottles are easier to fill, clean by hand, and scoop formula into without spillage, while standard-neck bottles are more compact and often cheaper. Neither affects how well a baby feeds — this is purely a day-to-day convenience choice, and mixing both types across your bottle collection causes no issue.

If you're formula feeding and mixing bottles multiple times a day, the easier-fill wide-neck design saves real time and mess — for occasional expressed-milk bottles, the difference matters much less.

Step 5. Bottle Size Should Match Actual Feed Volume, Not Maximum Capacity

Newborn feeds are small — often 60-90ml to start — so a 150-160ml bottle, like the Tommee Tippee Natural Start 150ml, suits early feeding better than jumping straight to a 240-330ml bottle sized for a much older baby. Buying oversized bottles from the start doesn't cause harm, but it does mean a mostly-empty bottle for months.

Most starter sets include a couple of smaller bottles specifically for this reason — worth having a few in the smaller size even if you also buy larger ones for later, rather than only the bigger format.

Step 6. A Bottle Warmer or Prep Machine Solves a Different Problem Than the Bottle Itself

Devices like the Tommee Tippee PerfectPrep Pro speed up and standardise formula preparation, which is a separate concern from the bottle and teat themselves — a fast prep machine doesn't change how well a baby feeds from whichever bottle you pour into. See our dedicated bottle warmer guide for that side of the decision specifically.

Buying a prep machine or warmer isn't a requirement to make any particular bottle "work properly" — it's a convenience layer on top, worth its own separate decision rather than bundled into choosing the bottle itself.

Quick Picks by Budget

Budget: Tommee Tippee Natural Start 150ml — £15.49, a newborn-sized starter bottle with anti-colic venting.

Mid-range: MAM Easy Start Bottle Set — £51, a full starter set so you're not guessing the right flow rate.

Premium: Tommee Tippee PerfectPrep Pro — £199.99, standardises formula prep separately from the bottle itself.

FAQ

Is glass or plastic better for baby bottles?
Neither is safer — both meet the same UK standards. Glass is more durable against scratching but heavier and breakable; plastic is lighter but shows wear over time. See Step 1.

Do anti-colic bottles actually work?
For many babies, yes — the venting system genuinely reduces swallowed air, which can ease gassiness and spit-up. It isn't guaranteed to fix every case, since spit-up has multiple causes. See Step 3.

What size bottle should I start with?
A smaller size (around 150-160ml) suits early newborn feed volumes better than a bottle sized for an older baby, even though it won't be needed at full capacity for long. See Step 5.

Does teat flow rate matter more than the bottle brand?
Yes, significantly — it should match how your specific baby feeds, not just their age. See our full feeding guide, and Step 2 here, for what to actually watch for.