Formula Feeding: A Complete Guide for UK Parents

Quick answer: For most healthy, full-term UK babies, a standard first infant formula is the only formula recommended from birth and is suitable throughout the first year. Sterilise all feeding equipment until 12 months, prepare each feed fresh with boiled water still above 70°C, cool it and test on your wrist, and throw away any formula left in the bottle after a feed.

What parents need to know

Formula feeding is the choice of many UK parents, whether from the very beginning, or after a period of breastfeeding. Whatever your reason, you deserve clear, non-judgmental information to do it safely and well. This guide covers everything from choosing a formula to sterilising, preparing feeds, and knowing how much your baby needs.

Choosing a formula

There are many formula options available in the UK. For most healthy, full-term babies, a standard first infant formula based on whey-dominant cow's milk protein is appropriate from birth onwards. It's the only formula recommended for newborns.

Other types you'll see on the shelf include:

• Hungry baby formula: Contains more casein than whey, and casein is harder for babies to digest. The NHS says there is no evidence babies settle better or sleep longer on it, and to ask a midwife or health visitor before using it.
• Comfort formula: Partially hydrolysed protein, marketed to help with colic and constipation, but the NHS says there is no evidence it does. It is not suitable for babies with cows' milk allergy. Ask a midwife or health visitor first.
• Anti-reflux formula: Thickened to reduce regurgitation. Only use if recommended by a health professional.
• Follow-on formula: Marketed for babies over 6 months. The NHS states it is not necessary — first infant formula is suitable throughout the first year.
• Specialist formulas (hypoallergenic, soya-based, etc.): Only for babies with diagnosed allergies or intolerances, and only on medical advice.

Brand switching is fine if needed. All UK first infant formulas meet the same strict nutritional standards.

How much formula does my baby need?

A rough guide by age (always follow your baby's hunger cues; this is approximate):

• Newborn (0–1 month): 60–90ml per feed, every 2–3 hours (approximately 8 feeds in 24 hours)
• 1–2 months: 90–120ml per feed, every 3–4 hours
• 2–4 months: 120–180ml per feed, every 4 hours
• 4–6 months: 150–210ml per feed, 4–5 feeds per day
• 6–12 months: 180–240ml per feed, 3–4 feeds per day (alongside solids from 6 months)

Never force your baby to finish a bottle. Responsive bottle feeding, watching for hunger and fullness cues and allowing your baby to lead, is as important with formula as with breastfeeding.

Sterilising equipment

All feeding equipment must be sterilised until your baby is 12 months old. Methods include:

• Cold water sterilising with sterilising tablets or solution
• Steam sterilising (electric or microwave)
• Boiling — submerge items fully and boil for at least 10 minutes

Always wash items thoroughly in hot, soapy water before sterilising, and make sure all milk residue is removed.

Preparing a formula feed safely

The NHS recommends preparing each feed fresh, as needed. The steps:

1. Boil fresh tap water and leave to cool for no more than 30 minutes (water should still be above 70°C when adding powder — this kills potential bacteria in the powder).
2. Clean and disinfect the surface you're going to use, and wash your hands.
3. Pour the correct amount of the boiled water into the sterilised bottle while it is still hot (at least 70°C), before adding the powder.
4. Add the correct number of level scoops of powder (using the scoop provided, never pack it).
5. Attach the teat and lid, and shake to dissolve.
6. Cool to feeding temperature under cold running water or in a bowl of cold water.
7. Test on the inside of your wrist before feeding. It should feel lukewarm, not hot.

Throw away any formula left in the bottle after a feed. Don't reheat or reuse leftover formula.

Can I make bottles in advance?

The NHS advises making up feeds one at a time, as your baby needs them, because bacteria can survive and multiply even in the fridge. If you cannot make up a fresh feed, for example when you are away from home, use a carton of ready-to-feed liquid formula. If you have no other option, you can make up a feed in advance as a one-off, but do not do this regularly. Make it up as above, cool it under a running tap or in a bowl of cold water and put it in the fridge. Use it within 24 hours if kept in the fridge, within 4 hours in a cool bag with an ice pack, or within 2 hours at room temperature. Never warm formula in a microwave.

Responsive bottle feeding

Responsive feeding is just as important with formula as with breast milk. Principles:

• Feed when your baby shows hunger cues, not on a rigid schedule (especially in the early weeks)
• Hold your baby semi-upright during feeds
• Pause and allow them to take breaks
• Never force a baby to finish a bottle
• Wind regularly during and after feeds

Frequently asked questions

How long can made-up formula stay in the fridge?

The NHS advises making up feeds one at a time, as your baby needs them, and using a carton of ready-to-feed liquid formula when you cannot. If you have no other option and make up a feed in advance as a one-off, use it within 24 hours if kept in the fridge, within 4 hours in a cool bag with an ice pack, or within 2 hours at room temperature. Never warm formula in a microwave.

Do I need follow-on formula after 6 months?

No. Follow-on formula is marketed for babies over 6 months, but the NHS states it is not necessary — first infant formula is suitable throughout the first year.

Can I switch formula brands?

Yes. Brand switching is fine if needed, because all UK first infant formulas meet the same strict nutritional standards.

How long do I need to sterilise bottles for?

All feeding equipment must be sterilised until your baby is 12 months old, using cold water sterilising, steam sterilising, or boiling for at least 10 minutes. Wash items in hot soapy water first to remove all milk residue.