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 discard any formula left after 2 hours.

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: Casein-dominant and slower to digest. The NHS doesn't recommend it as it offers no proven benefit and can make it harder to recognise hunger cues.
• Comfort formula: Partially hydrolysed protein; sometimes recommended for wind or colic. Speak to your 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 ensure 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. Fill the sterilised bottle with the correct amount of cooled boiled water.
3. Add the correct number of level scoops of powder (using the scoop provided — never pack it).
4. Attach the teat and lid, and shake to dissolve.
5. Cool to feeding temperature under cold running water or in a bowl of cold water.
6. Test on the inside of your wrist before feeding — it should feel lukewarm, not hot.

Discard any formula not consumed within 2 hours. Do not reheat leftover formula.

Can I make bottles in advance?

The NHS advises making feeds fresh as above wherever possible. If you need to prepare in advance (e.g., for night feeds), prepare as above, cool quickly, store in the back of the fridge (4°C or below) for up to 24 hours, and reheat by standing in warm water (never microwave). Discard after 24 hours.

Responsive bottle feeding

Responsive feeding is just as important with formula as with breast milk. Key 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?

If you need to prepare feeds in advance, cool them quickly and store them at the back of the fridge at 4°C or below for up to 24 hours. Reheat by standing the bottle in warm water, never in a microwave, and discard after 24 hours.

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.