Aged 18 months, from Beit Shemesh, Israel. These boys were born in week 31 weighing only 1.6 and 1.7 kg. They have two older siblings. The boys shared placenta, which caused complications during pregancy.  "Mikey and Gavi have a private language which they use to communicate with eachother". "Their personalities are quite different, one is very adventurous, while the other is more cautious". " I would never dress them the same. It's so important that they develop separately". Their 3 year old brother can’t tell the apart, and just calls them "baby”.