Clothes for a twin baby boy and girl will often need to be smaller than average newborn baby clothes, because It's estimated that half of all twin boys and girls are born early, prior to 36 weeks gestation, which is almost a month before the standard 40 weeks gestation of a singleton baby.

There is an even greater chance of going into labor prematurely with triplets and other higher-order multiples. In some cases, the onset of preterm labor cannot be halted, while in other situations, risks to the mother or babies require an early conclusion to the pregnancy. There are many reasons why twins are born early, and will need premature baby clothes, and these are some of the most common:

It is not possible to predict if a woman with a healthy pregnancy - with one baby, twins, or multiples - will go into spontaneous premature labour (although it is known that if you have had a previous, unexplained premature birth it is more likely to happen again). Similarly, there are often no indicators that an issue will develop that requires an early delivery, and therefore clothes for premature baby twins. No medication given to women with twins to prevent pre-term delivery has been shown to have an improved outcome.

Clothes for a twin baby boy and girl are available in typical girl and boy colours and patterns, like blue for twin baby boy clothes and pink for twin baby girl clothes, and lions and dinosaurs for boys, and bunnies and flowers for girls. But there are also lots of unisex clothes for baby twins available so both twins can wear little matching outfits.