Do you want to know which baby clothes you need for the first few months, how many and which ones are really useful? We've spoken to the experts - the midwifes from HEBAMMEHOCH2 and HEBAMMENPRAXIS ZÜRICH to develop this newborn clothing guide for you! It's our minimalist approach to a baby checklist because you will not need a lot to start with, but you'll need the right things in good quality.


The must-haves are a total of 20-22 pieces per size, assuming you're doing 1-2 laundries per week.

Most babies start with the size 50 or 56 and outgrow these within a few weeks only. With OiOiOi, you can even start at size 44 (preemie) and upsize anytime. Your new bundle will arrive within 3-5 working days from placing an order.

Because newborns change their size really quickly, we recommend sticking to the must-haves at first and considering borrowing or renting instead of buying everything new. The learning curve is steep and you will figure out pretty quickly what is useful for you and your baby.

See plans
  • 6 long-sleeved bodysuits

    ...because newborns cannot regulate their body temperature very well, we stick to our midwife's recommendation to cover the limbs. Kimono or wrap bodysuits are very practical because newborns cannot hold their head yet.

  • 4 trousers

    ...ideally with feet included or trousers + 6 pair of socks. Integrated feet are practical because they keep the feet warm and socks always "fall" off.

  • 3 pajamas

    ...snuggly, warm and made of breatheable textiles, covering the baby's entire body. We recommend the ones with buttons top to bottom at the front, for easy changing during the night.

  • 3 onesies

    ...or rompers, dungarees, jumpsuits etc. The most comfortable daywear for a baby and so easy to put on. A bodysuit underneath and baby is dressed and warm.

  • 2 cardigans

    ...with buttons, so you don't have to pull it over your newborn's fragile head. Layering is easily done with our knit cardigans for baby's optimal temperature.

  • 2 hats winter and summer. In the cold season because most of the body heat is lost through the head and in summer to protect the sensitive skin from the sun.

  • 2 sleeping bags

    ...for alternating. We recommend 1.5 TOG - 2.5 TOG filling if your room temperature is around 20-22 degrees at night.

  • 1 overall

    ...or jacket, but overalls are much more comfortable for newborns plus keep the entire body warm. This is an essential for winter, so your little one can enjoy the fresh air.

  • 1 pair of booties

    ...or thick socks. We recommend the ones of our partner brand hvid made from finest merino wool in Italy.

    Discover hvid 


How do I know which size to get for the first weeks?

Check the percentile curve with your gynaecologist to estimate whether your baby needs a 50 or rather a 56. This is assuming your baby will come around due date. If your baby is born prematurely, we do carry MIDI bundles in size 44 as well.

How often do I need a new size?

Usually every 6-8 weeks in the first year. The average rental period of our customers is 52 days per size. Thus, we recommend getting only a minimum of clothes per size.

How tight/loose should the clothes fit?

The baby should be able to stretch arms & legs well, usually a finger width between the fabric and the body is good fit, which is also helping when dressing them. If you get oversized clothes and they're too loose, you risk the baby is not warm enough.

What do I need for the hospital?

Only ONE set to go home. The hospitals in Switzerland are providing baby clothes for your stay.

Size guide


Which materials should baby clothes be made of?

We recommend NATURAL, BREATHABLE fabrics which help the babies regulate their body temperature. We work with organic cotton for the clothes, which is vegan, breatheable and does not use any chemical pesticides in growing and no harmful chemicals in production - the toxins-free clothes are extra soft to baby's sensitive skin.

Think about the baby's comfort! 

Wool can be itchy, synthetics made from petroleum sources might not be that breathable. Thanks to a small percentage of elastan added to our organic cotton clothes, the clothes are stretchy and fit the baby comfortably.

Think practically! 

Do you want to wash your baby's clothes together with yours and maybe tumble dry instead of spending your time hanging the laundry to dry? You don't have time to do hand-wash and brush or treat your clothes with special equipment? That's exactly why we work with organic cotton for the clothing must-haves.

Wash & Care


Having a summer baby? 

While textiles can be lighter, we'd recommend covering the newborn's limbs if possible to protect them from the sun. You'll be surprised to see that newborns need the same essentials as in winter, because they don't have too much fat yet to protect their body and usually little hair to keep the head warm enough.

Having a winter baby?

Layering it is! Bodysuit + Trouser/Romper for inside, add layers of Pullover and/or Overall plus a warm hat for outside. Midwifes teach us that hats are important as most of the body's heat is lost through the head.

How do you know if your baby's too hot or cold?

If they're too hot you can feel it at the back of their neck and if they're too cold you'll feel it by touching their underarms/lower legs. Feeling the temperature at the baby's hands and feet might not be accurate, as there's less blood flowing through these areas.


When it comes to your baby starter kit, it's rather about finding practical, functional clothes in good quality than about quantity. Here are a few things to watch to get the right baby clothes essentials:

Trousers with integrated feet and a wide, soft waistband

Kimono/Wrapbodysuits with buttons in the front so you won't have to pull the bodysuit over the baby's head and neck, which is still unstable in the first few months.

Rompers and Pyjamas buttoned from top to bottom for ease of changing diapers.

Hats should fit tightly around a newborn's head and for babies a few months old we suggest strap bonnets so the hats actually stay on.

Cardigans instead of pullovers. Also here, buttons do the trick and make dressing your baby a lot easier.