Baby Grows & Baby Sleepsuits

Yes. In the UK, "sleepsuit", "babygrow", "baby grow" and "all-in-one" all describe the same thing: a one-piece, long-sleeved suit with legs. Different families use different words for it. Ours were previously called Rompers but due to community feedback, we have changed to babygrow.

Most parents start with 5 to 7 and build from there. Newborns get through two or three a day once you count the changes nobody warns you about, so you want enough to cover a wash cycle plus a spare in the changing bag.

It depends on the room, and on whether they're awake or asleep. While awake in the daytime, a babygrow on it's own is usually plenty in a warm room. As it cools, a bodysuit underneath adds a layer without extra bulk: short-sleeved as it starts to cool, long-sleeved for colder rooms. At night the babygrow is the layer that goes under a TOG-rated Sleep Bag or Swaddle Up™ Our clothing guide sets out what to wear at each room temperature.

A babygrow or sleepsuit is a clothing layer, so it isn't given a TOG rating of its own. TOG belongs to whatever goes over the top, whether that's a Swaddle Up™ or a sleep bag, the same way a warmth rating belongs to the duvet rather than the sheet. Choose your sleepwear TOG for the room temperature first, then use the babygrow as the layer underneath.

Zips are common across baby sleepwear and are easier to manage than poppers in the dark. Ours are two-way, so you can open from the bottom for a nappy change without undoing the whole suit, and they’re designed to sit smoothly under a swaddle or sleep bag with no bunching, rubbing or bulky seams. For safer sleep, follow the guidance on the sleep garment worn over the top.

Take a mix. Two or three in the smallest size and two or three in the next size up covers most babies, since birth weight is hard to predict. Our size guide has the full measurements, so go by those rather than by age.