Baby Bodysuits

In the UK, usually yes: both words mean a top that fastens under the nappy with poppers, which stops it riding up. We call ours bodysuits, and they have an envelope neck so they can come off downwards after a leak.

It's worth having some of each. Short sleeves do the work all year under a sleepsuit and on their own when it's warm; long sleeves are the warmer layer for winter and look better as a top with leggings. The fabric is the same soft bamboo rib in both.

Use the size guide rather than the age on the label: it gives the body length and chest of every size. The packs come in Newborn to 9-12 months, and they're cut to fit up to two months longer than standard, so on the edge of two sizes, take the smaller. You can exchange them within 30 days of your order if they're unused and unwashed, with the tags on.

About six per size covers a wash cycle, as bodysuits go through the wash as often as anything your baby wears. A 5 pack, or two 3 packs, gets you there without buying so many that some are outgrown before they're worn.

Yes, as the layer next to their skin. On a warm night a bodysuit can be enough by itself, and when it's cooler it goes under a sleepsuit or a sleeping bag. Feel the back of your baby's neck or their tummy to check they're not too hot.