What Should a Baby Wear in Summer in the UK? A Mum’s Honest Advice

I remember sitting on the sofa, staring at my Newborn, Violet, with a mix of love and pure panic. It was June, and the weather had just turned very warm. She was just a week or so old, and I hadn’t the faintest clue what to dress her in. A vest? A sleepsuit? Nothing at all? Having accidentally had her at home (yes, really!), I missed out on those helpful hospital leaflets. I was winging it — and constantly worrying if she was too hot or too cold.

If you’re a new mum, or expecting a baby during a UK summer, I get it. It’s confusing, overwhelming, and you're desperate to get it right. So let’s chat through some gentle, practical advice from someone who's been there — plus, I’m helping my sister prepare for her own summer baby this year, so it’s all fresh in my mind!

What Should a Baby Wear During the Day in UK Summer?

British summers can be unpredictable — one minute it's 28°C, the next it’s cloudy and breezy. But generally, on warm days, the key is lightweight, breathable clothing.

Think short-sleeved cotton bodysuits, muslin layers, or soft rompers that don’t cling. Personally, I found rolled hem rompers and relaxed shorts a lifesaver. They’re comfy, made from stretchy cotton jersey, and let baby’s skin breathe without getting too much sun. Bonus: they’re easy for nappy changes, which is a huge win in the early days!

On very hot days (over 24°C), a single layer like a romper or even just a nappy in the shade may be enough. You can always add a muslin or vest if it cools down.

Do Babies Need a Vest in Summer?

This is one of the most common questions — and the answer is: it depends.

If it’s warm but not boiling, a vest under a lightweight romper or top can be perfect. It adds a layer of softness and helps absorb sweat. But if it’s really hot? You can absolutely skip the vest. One layer is plenty when it's over 24°C indoors.

Trust your instincts, and remember: the general rule is one more layer than you’re wearing — but on very warm days, babies may need the same or even less than you, especially if you’re moving and they’re still.

How to Tell if Your Baby is Overheating

One of my biggest fears was overheating Violet. I’d constantly check her, not really knowing what to look for. Here’s what I learned:

• Feel the back of their neck – if it’s sweaty or hot, they may be too warm.

• Look for flushed cheeks or rapid breathing.

• If they’re irritable or restless, it could be heat-related.

Avoid checking hands or feet — they’re often cooler and not a good temperature guide. The NHS has great guidance on baby temperatures and The Lullaby Trust also offers advice on preventing overheating, especially during sleep.

Keep Baby in the Shade

It goes without saying — but it’s easily forgotten in the excitement of a walk or garden visit: babies under 6 months should be kept out of direct sunlight completely.

Their skin is incredibly delicate, and sunburn can happen fast. Use a pram with a sunshade (not a blanket draped over — it can trap heat), sit under trees, and keep car journeys short where possible.

Light layers, sun hats, and a cool cotton romper can make all the difference. And if you’re using a carrier, try one with a breathable panel, and watch baby’s face for signs of overheating.

Final Thoughts (And a Big Hug)

If you’re googling “what should a baby wear in summer UK,” you’re probably already doing your very best. I remember that feeling so well — second guessing every outfit, worrying constantly. But here’s the truth: you will figure it out. You’ll get a feel for your baby, for the weather, and for what works.

Keep it simple. Use soft, breathable clothes (like rolled hem rompers, relaxed shorts or pinafore dresses). Stay in the shade. Trust your gut.

And please hear this loud and clear: You’re doing a great job!

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Disclaimer

This blog is written from personal experience and should not be taken as medical advice. For professional guidance, always consult your midwife, health visitor, or GP. For safe summer care, visit the NHS and The Lullaby Trust.