Bottle feeding is the one feed where dads can take the lead. Whether the milk is formula or expressed breast milk, this is your primary contribution in the first weeks. Done well it gives your partner a real break, builds your bond with the baby, and shares the load. Done badly it causes wind, reflux, overfeeding, and (if breastfeeding is in the mix) latch problems.
Most online bottle feeding content is written for mums, by mums, with you in the background. This guide is the opposite. Practical, dad-first, evidence-based, no fluff. Built from NHS guidance, NICE postnatal advice, the UNICEF Baby Friendly Initiative, and what actually works at 3am.
Bottle feeding basics: the four things that actually matter
Forget the hundred things you can buy. Four things determine whether a bottle feed goes well:
- Position: baby semi-upright, not flat on their back.
- Latch: wide mouth, lips sealed around the wide base of the teat.
- Pace: bottle horizontal, frequent pauses, baby in control.
- Cues: stop when the baby tells you they are done, not when the bottle is empty.
Get those four right and the rest is detail.
Paced bottle feeding: the technique you actually want
Paced bottle feeding is the technique recommended by lactation consultants, the NHS, and the UNICEF Baby Friendly Initiative. It mimics the slower, more deliberate pace of breastfeeding. The point is to stop the bottle from emptying gravity-fed into the back of the baby's throat at a speed they cannot control.
Why it matters even if your baby is purely formula fed: babies who can pace themselves stop when full, take in less wind, get less reflux, and sleep better after feeds. Babies that are bottle-blasted at speed often look full and content, then projectile-vomit fifteen minutes later.
Hold baby semi-upright
Cradle the baby in the crook of your arm so their head and shoulders are higher than their bottom, body in a roughly 45 degree position. Never feed a baby flat on their back: it floods the throat and increases ear infection risk.
Tickle the lips with the teat
Touch the teat gently to the baby's top lip and wait. Do not push it into a closed mouth. Wait for them to open wide, the way they would latch onto a breast. This puts the baby in charge of the timing.
Insert the teat fully
Once the mouth is wide, slide the whole teat in so the lips seal around the wide base of the teat, not just the tip. A tip-only latch creates a fast flow and lets in air. A full latch is calmer and slower.
Hold the bottle horizontal
Keep the bottle level with the floor. The teat should be only half full of milk. This forces the baby to actively suck rather than have milk gravity-poured in. If milk is dripping freely from the teat when the bottle is upside down, the flow is too fast: switch to a slower-flow teat.
Pause every 1 to 2 minutes
Tip the bottle down so the milk drains out of the teat, leaving the teat in the mouth. Pause for 5 to 10 seconds, then tip back up. This mimics the natural pauses between let-downs at the breast and gives the baby time to register fullness. It is the single biggest difference between paced and rushed feeding.
Switch sides halfway
Move the baby to the other arm halfway through the feed. This balances eye stimulation, mimics breastfeeding side-switching, and stops you getting a dead arm. Babies fed on one side every time can develop a side preference.
Watch for fullness cues
Stop when the baby slows, turns away, falls asleep, pushes the bottle out with their tongue, or splays their fingers. You do not need to finish the bottle. Letting them stop is more important than emptying it. Forced feeding is the most common cause of overfeeding, reflux, and bottle aversion.
Wind, then settle
Sit the baby upright, support the head and chin with your hand, and rub or pat their back gently for a couple of minutes. Some babies bring up wind easily, some never do. If nothing comes after 2 to 3 minutes, stop. Wind is not mandatory.
The 20-minute rule. A paced bottle feed should take roughly 15 to 20 minutes, similar to a breastfeed. If the baby is finishing a 120ml bottle in 4 minutes, the flow is too fast or the latch is too shallow. Slow it down.
How much formula to feed your baby
The NHS rule of thumb: around 150 to 200ml of formula per kilogram of body weight per day for the first 6 months, divided across feeds. So a 4kg baby needs roughly 600 to 800ml across 24 hours.
Translated into practical bottles:
| Age | Per feed | Feeds per day |
|---|---|---|
| Newborn (under 2 weeks) | 30 to 60ml | 8 to 12 |
| 2 to 4 weeks | 60 to 90ml | 7 to 9 |
| 1 to 3 months | 90 to 150ml | 5 to 7 |
| 3 to 6 months | 150 to 210ml | 4 to 6 |
| 6 to 12 months | 180 to 240ml | 3 to 5 (plus solids) |
These are guides, not targets. Babies do not eat the same amount at every feed. Some feeds are big, some are small. Track the day, not the bottle. If your baby is having around the right total, gaining weight, and producing 6 to 8 wet nappies a day, the amounts are working.
Choosing bottles and teats
You can spend £200 building a bottle collection or you can spend £15 and be fine. The features that actually matter:
- Slow-flow teat (size 1 or "newborn"). Fast-flow teats are the single biggest cause of bad feeds. Stay on slow-flow longer than the box recommends.
- Wide base teat for a deep, breast-like latch. Narrow teats encourage tip-feeding.
- Soft silicone teat that flexes like a breast.
- Anti-colic vent if your baby is windy. Dr Brown's is the gold standard but adds cleaning time.
Brands commonly recommended for breastfed babies who also bottle-feed: MAM, Tommee Tippee Closer to Nature, Lansinoh NaturalWave, Nuk First Choice, and Dr Brown's Options+. Try one bottle before buying a six-pack. Babies have strong preferences and the £4 bottle they accept is better than the £18 bottle they refuse.
Formula vs expressed breast milk
The mechanics of feeding are the same. The differences are in handling and storage.
Formula
- NHS guidance: make up each bottle fresh as needed using freshly boiled water that has cooled for no more than 30 minutes (so it is still around 70 degrees, hot enough to kill bacteria in the powder).
- Cool the made bottle by holding under cold running water until it is body temperature.
- Use within 2 hours of making. Discard any unfinished bottle after 1 hour.
- Never microwave.
- Ready-made cartons are sterile and easier for night feeds. More expensive but worth it for the 3am feeds.
Expressed breast milk
- Fresh expressed milk: room temperature for up to 4 hours, fridge up to 4 days, freezer up to 6 months (according to NHS guidance).
- Defrost in the fridge overnight or under warm running water. Never in the microwave.
- Once defrosted, use within 24 hours.
- Once warmed, use within 1 hour.
- It may smell soapy or metallic. This is normal and does not mean it has gone off.
Sterilising bottles: what dads need to know
UK NHS guidance: sterilise all bottles, teats, and feeding equipment after every use until your baby is at least 12 months old. Three main methods:
Steam steriliser (electric)
Quickest. About 6 minutes for a cycle. Equipment can stay sterile inside for 24 hours if the lid stays closed. The Tommee Tippee or Philips Avent units are reliable and simple. Worth the £40.
Microwave steriliser
Cheapest mains option. About 4 to 8 minutes depending on wattage. Equipment stays sterile for 24 hours.
Cold water sterilising
Milton tablets or sterilising fluid in cold water. Submerge for 30 minutes, change solution every 24 hours. Good for travel and holidays. Slight chemical smell that some babies dislike.
Dishwasher
A hot dishwasher cycle (above 80 degrees) is acceptable for cleaning but the NHS does not consider it sterilising. Wash in dishwasher then sterilise.
The one mistake to avoid. Never make formula bottles up in advance and store them in the fridge for night feeds. NHS guidance changed years ago on this. Pre-made bottles can grow bacteria. Either make fresh each time, or use ready-made cartons. The faff of 3am bottle prep is real, which is why the Perfect Prep machine and ready-made cartons exist.
Combination feeding: bottle and breast together
If your partner is breastfeeding and you want to do some bottle feeds, here is the playbook:
- Wait 3 to 4 weeks after birth before introducing the bottle, so breastfeeding is established and milk supply is settled.
- Use paced bottle feeding. This is non-negotiable for a breastfed baby. A fast bottle teaches them that milk should always come fast, and they will then get frustrated at the breast.
- Start with one feed a day. Often the late-evening feed or one in the night.
- Your partner should pump if she misses a feed, otherwise her supply will start to drop. If you do the 10pm feed, she pumps then or before bed.
- Find your role beyond feeding too. See how dads can actually support breastfeeding for the wider picture.
The night feed playbook
Night feeds are where bottle feeding earns its keep. Done well, you can take a full feed and let your partner sleep through it. Done badly, you both end up awake. The system that works:
- Pre-stage everything before bed: cooled boiled water in the bottle, formula scoops in the dispenser, muslin cloth ready, dim red light next to the chair.
- When the baby wakes, get them out the cot before they fully wake. Quiet voice, low light, no eye contact.
- Add the formula, shake to mix, run under cold water for 60 seconds to bring to body temperature.
- Feed in the dim light, paced, no chat, no phone.
- Quick wind, brief nappy if needed, straight back down.
The whole cycle should take 25 to 35 minutes. Anything longer and you are sliding into "fully awake" territory and the next sleep cycle becomes harder to land. For more on splitting nights with your partner, see how to split night feeds.
Common bottle feeding problems and fixes
Baby refuses the bottle
Most common when a breastfed baby is offered a bottle for the first time. Try: a different bottle, a different teat shape, dad doing it instead of mum (the smell of mum makes them want the breast), warm the teat under the tap before offering, try expressed milk before formula, try while the baby is sleepy rather than hungry-and-furious.
Baby chokes or gulps loudly
Flow is too fast. Switch to a slower teat, hold the bottle more horizontally, take more pauses. If the baby is making a wet smacking sound or you see milk pooling at the corners of the mouth, slow down.
Baby vomits after feeds
Likely overfeeding or fast flow. Reduce the bottle size, slow the pace, hold upright for 15 minutes after the feed. If this is constant and projectile, see our baby reflux guide.
Baby is super windy
Latch is too shallow or pace is too fast. Get the lips sealed around the wide base, hold horizontal, pause more. If wind is a constant problem, try anti-colic bottles like Dr Brown's.
Baby falls asleep mid-feed
Common in the first 6 weeks. Stroke the cheek, change the nappy halfway through, take their socks off, blow gently on the face. If they are taking less than usual, do not force the rest. Wait, offer again 30 minutes later if they wake hungry.
Baby refuses to take the bottle from mum but will from you
This is normal once they associate the breast with mum. Lean into it. The bottle is your job. Mum does the breast or skin-to-skin. Babies are pragmatic.
The 3am dad cheat sheet
One-page printable: feeding amounts by age, paced feeding checklist, fever thresholds, when to ring 111. Free.
The bottom line for dads
Four things matter: position semi-upright, latch deep on the wide base, bottle horizontal with frequent pauses, stop when the baby is done. That is the whole technique. Everything else is detail.
If your partner is breastfeeding, paced feeding is non-negotiable. If she is not, paced feeding still helps with wind, reflux, and overfeeding. Either way, the bottle feed is one of the few moments where you are the primary parent in the first weeks. Make it count. Slow phone down, eyes on the baby, no rush.
And the boring stuff: sterilise everything for 12 months, never microwave, make formula fresh, never force the bottle empty. That is 90 percent of what you need to know.
FAQ
How much formula should I feed my baby?
The NHS rule of thumb is around 150 to 200ml of formula per kilogram of body weight per day for the first 6 months, split across feeds. A 4kg baby is roughly 600 to 800ml per day. In practice this works out to 60 to 90ml per feed for newborns, building to 150 to 240ml by 6 months. Babies do not eat the same amount at every feed. Watch the baby, not the clock or the bottle.
What is paced bottle feeding and why does it matter?
Paced bottle feeding is a technique where you hold the bottle horizontally so the milk flow is slow, hold the baby semi-upright, and pause every minute or two. It mimics the natural pace and effort of breastfeeding. It prevents overfeeding, reduces wind and reflux, and stops bottle preference forming when you are also breastfeeding.
When can a dad start bottle feeding a breastfed baby?
Most lactation guidance suggests waiting 3 to 4 weeks after birth, until breastfeeding is well established and milk supply is settled. Earlier introduction can confuse the latch or undermine supply. After about 4 weeks, dads can take one feed a day with expressed milk. Use paced bottle feeding to keep the technique close to breastfeeding.
What temperature should the bottle be?
Body temperature, around 37 degrees Celsius, is what babies expect from the breast. Test by shaking a few drops onto the inside of your wrist. It should feel warm but not hot. Most babies tolerate slightly cooler milk, but very few will take cold milk straight from the fridge. Never warm a bottle in the microwave: it creates dangerous hot spots.
How do I know which bottle is best for a breastfed baby?
There is no single best bottle. The features that matter for a breastfed baby are: a slow-flow teat (size 1 or newborn), a wide base that encourages a deep latch, and a soft silicone teat that flexes like a breast. Brands commonly recommended include MAM, Tommee Tippee Closer to Nature, Lansinoh, and Dr Brown's. Try one bottle before buying a six-pack. Babies have preferences.
Do I need to sterilise bottles every time?
Yes, for the first 12 months in the UK. The NHS guidance is to sterilise all bottles, teats, and feeding equipment after every use until the baby is at least 12 months old. Cold water sterilising tablets, steam sterilisers, and microwave sterilisers all work. After sterilising, equipment can be left in the steriliser for up to 24 hours if the lid is closed.